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Last modified: Fri Sep 26 18:17:39 2025.

# Directory Listing of Routines

# general/missions/rbsp/efw/utils

- EXPAND_TILDE()
  Expand tilde in UNIX directory names
- FINDPATH[2]
- JBT_DATE2JDAY (FUNCTION)
  Convert a date string in format 'yyyy-mm-dd', such as '2012-10-16', into a
- JBT_EXTREMA (FUNCTION)
  Find extrema in a numerical array and return their indices.
- JBT_FEXIST (FUNCTION)
  Check the existence of a local file. Return 1 if the file exists, or 0 if
- JBT_FILE_LATEST (FUNCTION)
  Return the path of the latest file within a folder.
- [6]
  Retrieve a list of files on a remote directory accessible via http.
- JBT_GET_LINES (FUNCTION)
  Get all lines of a text file.
- JBT_ICONSEC (FUNCTION)
  Given an array of indices, find consecutive sections in the array, and
- JBT_JDAY2DATE (FUNCTION)
  Convert a longword integer Julian day number into a date string in format
- JBT_TPLOT_POS (FUNCTION)
  Get the positions of tplot panels. The returned array has the form
- RBSP_BTRANGE (PROCEDURE)
  This routine is to find the starting time and ending time of each
- RBSP_DECIMATE (PROCEDURE)
  Decimate a tplot variable. Be default, the routine only decimate the input
- RBSP_MIN_VAR
- RBSP_MIN_VAR_ROT
- RBSP_ROTATE_FIELD_2_VEC
- RBSP_SAMPLE_RATE
- TPLOT_ZOOM (PROCEDURE)
  This is basically a wrapper of some of the functions of tlimit and timebar.
- TPLOT_ZOOM_COM

# Routine Descriptions

## EXPAND_TILDE()

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     NAME:
          EXPAND_TILDE()

     PURPOSE:
           Expand tilde in UNIX directory names

     CALLING SEQUENCE:
           IDL> output=expand_tilde(input)

     INPUTS:
           INPUT = input file or directory name, scalar string

     OUTPUT:
           Returns expanded filename, scalar string

     EXAMPLES:
           output=expand_tilde('~zarro/test.doc')
                   ---> output='/usr/users/zarro'

     NOTES:
           This version of EXPAND_TILDE differs from the version in the Solar
           Library in that it does not call the functions EXIST and IDL_RELEASE.
           However, it should work identically.
     PROCEDURE CALLS:
           None.
     REVISION HISTORY:
           Version 1,  17-Feb-1997,  D M Zarro.  Written
           Transfered from Solar Library   W. Landsman   Sep. 1997
           Made more robust  D. Zarro/W. Landsman  Sep. 2000
           Made even more robust (since things like ~zarro weren't being expanded)
           Zarro (EITI/GSFC, Mar 2001)

(See general/missions/rbsp/efw/utils/expand_tilde.pro)

## FINDPATH[2]

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    FUNCTION: findpath.pro

    PURPOSE: Finds the path to a particular file in current IDL paths

    ARGUMENTS:
        FILENAME  -> Name of the file to find   - STRING
        PATH      <- Path to file (without "/") - STRING

    RETURNS:  Status of find
                0 - Failure
                1 - Success (exact match)
                2 - Success (after adding ".pro")

    KEYWORDS:
        EXACT    /  Find exact match only (Don't try to add '.pro')
        VERBOSE  /  Print out search pathes

    CALLING SEQUENCE: found=findpath('filename',pathname)
                      case found of
                        0 : ERROR
                        1 : fullpath=pathname+'/'+filename
                        2 : fullpath=pathname+'/'+filename+'.pro'
                      endcase
                  or
                      if not findpath('filename',path,/exact) then ERROR

    NOTES:  By default, FINDPATH searches for exact match.  If not found
            looks for 'filename' with ".pro" appended (unless /EXACT keyword
            is set).

    CREATED BY: John P. Dombeck 7/03/2001

    MODIFICATION HISTORY:

      07/03/01- J. Dombeck    Original writing
      06/25/04- J. Dombeck    Added VERBOSE keyword
                              Changed close -> free_lun

(See general/missions/rbsp/efw/utils/findpath.pro)

## JBT_DATE2JDAY (FUNCTION)

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     NAME:
       jbt_date2jday (function)

     PURPOSE:
       Convert a date string in format 'yyyy-mm-dd', such as '2012-10-16', into a
       longword integer Julian day number.

     CATEGORIES:
       Utilities

     CALLING SEQUENCE:
       result = jbt_date2jday(date)

     ARGUMENTS:
       date: (In, required) A date string in format 'yyyy-mm-dd', such as
             '2012-10-16'.

     KEYWORDS:

     COMMON BLOCKS:

     EXAMPLES:

     SEE ALSO:

     HISTORY:
       2012-11-02: Created by Jianbao Tao (JBT), SSL, UC Berkley.
       2012-11-02: Initial release to TDAS. JBT, SSL/UCB.

     VERSION:
     $LastChangedBy: jianbao_tao $
     $LastChangedDate: 2012-11-02 16:35:10 -0700 (Fri, 02 Nov 2012) $
     $LastChangedRevision: 11172 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/jbt_date2jday.pro $

(See general/missions/rbsp/efw/utils/jbt_date2jday.pro)

## JBT_EXTREMA (FUNCTION)

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     NAME:
       jbt_extrema (function)

     PURPOSE:
       Find extrema in a numerical array and return their indices.

     CATEGORIES:

     CALLING SEQUENCE:
       result = jbt_extrema(array, interp_nan = interp_nan, min_only = min_only, $
         max_only = max_only, threshold = threshold)

     ARGUMENTS:
       array: (In, required) The array to find extrema in.

     KEYWORDS:
       /interp_nan: If set, remove NaNs by linear interpolation before searching
             for extrema.
       /min_only: If set, only return minima.
       /max_only: If set, only return maxima.
       threshold: (In, optional) Threshold for changing sense. For example, if
             threshold is 10 and A[i] and A[i+1] are two adjacent points in a local
             segment that generally has positive slope, then the segment will be
             treated as a full positive-slope segment if A[i+1]-A[i] > -10.
             Default = 0.

     COMMON BLOCKS:

     EXAMPLES:
         ; IDL code example
         npt = 100
         a = randomn(seed, npt)
         x = findgen(npt)
         ind = jbt_extrema(a)
         plot, x, a
         oplot, x[ind], a[ind], psym = 2, color = 6

     SEE ALSO:

     HISTORY:
       2012-11-10: Created by Jianbao Tao (JBT), SSL, UC Berkley.
       2012-11-12: Initial release in TDAS. JBT, SSL/UCB.

     VERSION:
     $LastChangedBy: jianbao_tao $
     $LastChangedDate: 2012-11-12 08:36:20 -0800 (Mon, 12 Nov 2012) $
     $LastChangedRevision: 11219 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/jbt_extrema.pro $

(See general/missions/rbsp/efw/utils/jbt_extrema.pro)

## JBT_FEXIST (FUNCTION)

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     NAME:
       jbt_fexist (function)

     CATEGORY:

     PURPOSE:
       Check the existence of a local file. Return 1 if the file exists, or 0 if
       not.

     CALLING SEQUENCE:
       result = jbt_fexist(file)

     ARGUMENTS:
       file: (In, required) A string of a local file to be checked.

     KEYWORDS:

     EXAMPLES:

     SEE ALSO:

     HISTORY:
       2011-05-01: Created by Jianbao Tao (JBT), CU/LASP.
       2012-11-02: Initial release to TDAS. JBT, SSL/UCB.

     VERSION:
     $LastChangedBy: jianbao_tao $
     $LastChangedDate: 2012-11-02 16:35:10 -0700 (Fri, 02 Nov 2012) $
     $LastChangedRevision: 11172 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/jbt_fexist.pro $

(See general/missions/rbsp/efw/utils/jbt_fexist.pro)

## JBT_FILE_LATEST (FUNCTION)

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     NAME:
       jbt_file_latest (function)

     PURPOSE:
       Return the path of the latest file within a folder.

     CATEGORIES:

     CALLING SEQUENCE:
       result = jbt_file_latest(dir)

     ARGUMENTS:
       dir: (In, required) A string of a local directory.

     KEYWORDS:

     COMMON BLOCKS:

     EXAMPLES:

     SEE ALSO:

     HISTORY:
       2012-10-28: Created by Jianbao Tao (JBT), SSL, UC Berkley.
       2012-11-02: Initial release to TDAS. JBT, SSL/UCB.

     VERSION:
     $LastChangedBy: jianbao_tao $
     $LastChangedDate: 2012-11-02 16:35:10 -0700 (Fri, 02 Nov 2012) $
     $LastChangedRevision: 11172 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/jbt_file_latest.pro $

(See general/missions/rbsp/efw/utils/jbt_file_latest.pro)

## JBT_GET_LINES (FUNCTION)

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     NAME:
       jbt_get_lines (function)

     PURPOSE:
       Get all lines of a text file.

     CATEGORY:

     CALLING SEQUENCE:
       result = jbt_get_lines(file)

     ARGUMENTS:
       file: (In, required) A string of a local text file to load.

     KEYWORDS:

     COMMON BLOCKS:

     SIDE EFFECTS:

     RESTRICTIONS:

     EXAMPLE:

     SEE ALSO:

     MODIFICATION HISTORY:
       2011-05-27: Created by Jianbao Tao, CU/LASP.
       2012-11-02: Initial release to TDAS. JBT, SSL/UCB.

(See general/missions/rbsp/efw/utils/jbt_get_lines.pro)

## JBT_ICONSEC (FUNCTION)

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     NAME:
       jbt_iconsec (function)

     CATEGORY:

     PURPOSE:
       Given an array of indices, find consecutive sections in the array, and
       return the starting and ending indices of each section. The returned value
       has dimension [nsec, 2]

     CALLING SEQUENCE:
       result = jbt_iconsec(indarr, nsec = nsec, npt = npt)

     ARGUMENTS:
       indarr: (In, required) An index array.

     KEYWORDS:
       nsec: (Out, optional) Number of consective sections in indarr.
       npt: (Out, optional) Number of points in each section.

     EXAMPLES:

     SEE ALSO:

     HISTORY:
       2011-05-20: Created by Jianbao Tao (JBT), CU/LASP.
       2012-11-12: Initial release in TDAS. JBT, SSL/UCB.

     VERSION:
     $LastChangedBy: jianbao_tao $
     $LastChangedDate: 2012-11-12 08:36:20 -0800 (Mon, 12 Nov 2012) $
     $LastChangedRevision: 11219 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/jbt_iconsec.pro $

(See general/missions/rbsp/efw/utils/jbt_iconsec.pro)

## JBT_JDAY2DATE (FUNCTION)

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     NAME:
       jbt_jday2date (function)

     PURPOSE:
       Convert a longword integer Julian day number into a date string in format
       'yyyy-mm-dd', such as '2012-10-16'.

     CATEGORIES:

     CALLING SEQUENCE:
       result = jbt_jday2date(jday)

     ARGUMENTS:
       jday: (In, required) A longword integer Julian day number.

     KEYWORDS:

     COMMON BLOCKS:

     EXAMPLES:

     SEE ALSO:

     HISTORY:
       2012-11-02: Created by Jianbao Tao (JBT), SSL, UC Berkley.
       2012-11-02: Initial release to TDAS.

     VERSION:
     $LastChangedBy: jianbao_tao $
     $LastChangedDate: 2012-11-02 16:35:10 -0700 (Fri, 02 Nov 2012) $
     $LastChangedRevision: 11172 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/jbt_jday2date.pro $

(See general/missions/rbsp/efw/utils/jbt_jday2date.pro)

## JBT_TPLOT_POS (FUNCTION)

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     NAME:
       jbt_tplot_pos (function)

     PURPOSE:
       Get the positions of tplot panels. The returned array has the form
       [n_panels, 4]. The meanings of the 4 values of each panel are:
           [*, 0]: left x
           [*, 1]: bottom y
           [*, 2]: right x
           [*, 3]: top y

     CATEGORIES:

     CALLING SEQUENCE:
       pos = jbt_tplot_pos(npanels = npanels, xpos = xpos, ypos = ypos, $
       enclose = enclose)

       xpos and ypos store locations for plots. For example,
           plots, xpos[0,*], ypos[0,*], color = 6 ; 6 = red
       will draw lines along the top panel frame.

     ARGUMENTS:

     KEYWORDS:
         npanels: (Output, optional)
         xpos: (Output, optional)
         ypos: (Output, optional)
         /enclose: (Input, optional)

     COMMON BLOCKS:

     EXAMPLES:

     SEE ALSO:

     HISTORY:
       2012-08-24: Created by Jianbao Tao(JBT), SSL, UC Berkeley.

     VERSION:
     $LastChangedBy: jianbao_tao $
     $LastChangedDate: 2012-11-02 16:35:10 -0700 (Fri, 02 Nov 2012) $
     $LastChangedRevision: 11172 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/jbt_tplot_pos.pro $

(See general/missions/rbsp/efw/utils/jbt_tplot_pos.pro)

## RBSP_BTRANGE (PROCEDURE)

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     NAME:
       rbsp_btrange (procedure)

     PURPOSE:
         This routine is to find the starting time and ending time of each
         continuous segment (burst, usually) of a give tplot variable which
         essentially is specified by a tplot name such as 'rbspa_efw_eb2'.

     CATEGORIES:

     CALLING SEQUENCE:
       rbsp_btrange, tvar, btrange = btrange, nbursts = nbursts, tind = tind, $
                       tlen = tlen, structure = structure

     ARGUMENTS:
       tvar: (INPUT, REQUIRED). The name of a tplot variable. If keyword STRUCTURE
             is set, tvar should be a tplot data structure from get_data.

     KEYWORDS:
        btrange: (OUTPUT, OPTIONAL) A named variable to return a 2D array as
                 [number_of_total_bursts, 2] which stores the the starting time and
                 the ending time of each continuous burst.
        nbursts: (OUTPUT, OPTIONAL) A named variable to return the number of
               bursts.
        tind: (OUTPUT, OPTIONAL) A named variable to return a 2D array of the index
               of starting and ending time points with structure
               [[starting],[ending]]
        tlen: (OUTPUT, OPTIONAL) A named variable to return the time lengths of
              all bursts.
        /structure: If set, tvar should be a tplot data structure.

     COMMON BLOCKS:

     EXAMPLES:

     SEE ALSO:

     HISTORY:
       2012-08-23: Created by Jianbao Tao (JBT), SSL, UC Berkley.

(See general/missions/rbsp/efw/utils/rbsp_btrange.pro)

## RBSP_DECIMATE (PROCEDURE)

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     NAME:
       rbsp_decimate (procedure)

     PURPOSE:
       Decimate a tplot variable. Be default, the routine only decimate the input
       data by one level, i.e., sample rate reduced by half.

     CATEGORIES:

     CALLING SEQUENCE:
       rbsp_decimate, tvar, upper = upper, level = level, newname = newname

     ARGUMENTS:
       tvar: (In, required) Tplot variable to be decimated.

     KEYWORDS:
       upper: (In, optional) If set, the output data's sample rate is no higher
             than the value of upper.
       level: (In, optional) Decimation level. Default = 1.
       newname: (In, optional) A tplot name for the output data. Default = tvar.

     COMMON BLOCKS:

     EXAMPLES:

     SEE ALSO:

     HISTORY:
       2012-11-03: Created by Jianbao Tao (JBT), SSL, UC Berkley.
       2012-11-05: Initial release to TDAS. JBT, SSL/UCB.

     VERSION:
     $LastChangedBy: aaronbreneman $
     $LastChangedDate: 2015-09-28 13:02:01 -0700 (Mon, 28 Sep 2015) $
     $LastChangedRevision: 18950 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/rbsp_decimate.pro $

(See general/missions/rbsp/efw/utils/rbsp_decimate.pro)

## RBSP_MIN_VAR

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    FUNCTION: rbsp_min_var.pro

    PURPOSE: Minimum Variance Analysis

    ARGUMENTS:
        X_DATA   -> X component of original data
        Y_DATA   -> Y component of original data
        Z_DATA   -> Z component of original data

    RETURNS: Minimum variance rotation matix (Eigen vectors, min to max)
               0 on failure

             The returned matrix is in the rotation matrix form where
                    N = R * O
               where
                   N = New matrix (Rotated into Min. Var. Coordinates)
                   R = Rotation matrix (Result from MIN_VAR)
                   O = Original matrix
                   * = Standard Matrix Multipication

    KEYWORDS:
        EIG_VALS <- Eigen values of minimum variance analysis (min to max)

    CALLING SEQUENCE:
           vectors=min_var(data.x,data.y,data.z,eig_vals=values)
                     or
           rot_arr=min_var(orig_arr[*,0],orig_arr[*,1],orig_arr[*,2]) ## orig_arr
                     or
           rot_arr=orig_arr # min_var(orig_arr[*,0],orig_arr[*,1],orig_arr[*,2])
                     or
           rot_arr=orig_arr ##
                     transpose(min_var(orig_arr[0,*],orig_arr[1,*],orig_arr[2,*]))
            (These last three forms will crash if min_var fails)

    NOTES:

    CREATED BY: John Dombeck August 2001

    MODIFICATION HISTORY:
    	08/06/01-J. Dombeck              Created
    	08/11/11-A. Paradise		 Added NAN handling, warning if NaN values exist
    	02/26/2014  Aaron Breneman   changed name to rbsp_min_var.pro. This version is exactly
    								the same as original except for name change.
    INCLUDED MODULES:
       min_var

    LIBRARIES USED:
       None

    DEPENDANCIES
       None

     VERSION:
       $LastChangedBy: aaronbreneman $
       $LastChangedDate: 2014-02-26 13:46:35 -0800 (Wed, 26 Feb 2014) $
       $LastChangedRevision: 14448 $
       $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/rbsp_min_var.pro $

(See general/missions/rbsp/efw/utils/rbsp_min_var.pro)

## RBSP_MIN_VAR_ROT

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    *****************************************************************************************

      FUNCTION :  rbsp_min_var_rot.pro
      PURPOSE  :  Calculates the minimum variance matrix of some vector array of a
                   particular input field along with uncertainties and angular
                   rotation from original coordinate system.

    ==-----------------------------------------------------------------------------
    *******************************************************************************
     Error Analysis from: A.V. Khrabrov and B.U.O. Sonnerup, JGR Vol. 103, 1998.

    avsra = WHERE(tsall LE timesta+30.d0 AND tsall GE timesta-30.d0,avsa)
    myrotma = MIN_VAR(myavgmax[avsra],myavgmay[avsra],myavgmaz[avsra],EIG_VALS=myeiga)

     dphi[i,j] = +/- SQRT(lam_3*(lam_[i]+lam_[j]-lam_3)/((K-1)*(lam_[i] - lam_[j])^2))

     dphi = angular standard deviation (radians) of vector x[i] toward/away from
             vector x[j]
    *******************************************************************************
      Hoppe et. al. [1981] :
          lam_3 : Max Variance
          lam_2 : Intermediate Variance
          lam_1 : MInimum Variance

            [Assume isotropic "noise" in signals]
          Variance due to signal (along MAX VARIANCE) : lam_1 - lam_3
          Variance due to signal (along INT VARIANCE) : lam_2 - lam_3

          Maximum Angular Change (along MIN VARIANCE) : th_min = ATAN(lam_3/(lam_2 - lam_3))
          Maximum Angular Change (along MAX VARIANCE) : th_max = ATAN(lam_3/(lam_1 - lam_2))

      -The direction of maximum variance in the plane of maximum variance is determined
        by the size of the difference between the two variances in this plane compared
        to noise.

      -EXAMPLES/ARGUMENTS
        IF lam_2 = lam_3   => th_min is NOT DEFINED AND th_max is NOT DEFINED
        IF lam_2 = 2*lam_3 => th_min = !PI/4
        IF lam_2 = 2*lam_3 => th_min = !PI/30

        IF lam_1 = lam_2 >> lam_3 => Minimum Variance Direction is still well defined!

    *******************************************************************************
      Mazelle et. al. [2003] :
            Same Min. Var. variable definitions

           th_min = SQRT((lam_3*lam_2)/(N-1)/(lam_2 - lam_3)^2)
            {where : N = # of vectors measured, or # of data samples}
    *******************************************************************************
    ==-----------------------------------------------------------------------------

      CALLS:
                   rbsp_min_var.pro

      INPUT:
                   FIELD  :  some [n,3] or [3,n] array of vectors

      EXAMPLES:

      KEYWORDS:
                   RANGE      :  2-element array defining the start and end point elements
                                   to use for calculating the min. var.
                   NOMSSG     :  If set, TPLOT will NOT print out the index and TPLOT handle
                                   of the variables being plotted
                   BKG_FIELD  :  [3]-Element vector for the background field to dot with
                                   MV-Vector produced in program
                                   [Default = DC(smoothed) value of input FIELD]

       CHANGED:  1)  Changed calculation for angle of prop. w/ respect to B-field
                       to the method defined directly above     [09/29/2008   v1.0.2]
                 2)  Corrected theta_{kB} calculation           [10/05/2008   v1.0.3]
                 3)  Changed theta_{kB} calculation, added calculation of minimum variance
                       eigenvector error, and changed return structure
                                                                [01/20/2009   v1.1.0]
                 4)  Fixed theta_kB calc. (forgot to normalize B-field)
                                                                [01/22/2009   v1.1.1]
                 5)  Added keywords:  NOMSSG and BKG_FIELD      [12/04/2009   v1.2.0]
                 4)  Fixed a typo in definition of GN variable  [12/08/2009   v1.2.1]

       CREATED:  06/29/2008
       CREATED BY:  Lynn B. Wilson III
        LAST MODIFIED:  12/08/2009   v1.2.1
        MODIFIED BY: Lynn B. Wilson III
    				  Aaron Breneman - changed name to rbsp_min_var_rot.pro. This version
    									is unchanged from original aside from name change

    *****************************************************************************************
     VERSION:
       $LastChangedBy: aaronbreneman $
       $LastChangedDate: 2016-09-02 10:42:46 -0700 (Fri, 02 Sep 2016) $
       $LastChangedRevision: 21790 $
       $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/rbsp_min_var_rot.pro $

(See general/missions/rbsp/efw/utils/rbsp_min_var_rot.pro)

## RBSP_ROTATE_FIELD_2_VEC

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     NAME: rotate_field_2_vec.pro
     SYNTAX: rbsp_rotate_field_2_vec,'waveform','vec'
    			where 'waveform' is a tplot variable and 'vec'
    			is either a tplot variable or an array of [3]

     PURPOSE: Returns rotation matrix and the input waveform or vector rotated to one of the following systems.
    				a) Min Var - input "vec" (e.g. DC Bfield) only
    					z-hat defined to be direction of "vec"
    					y_hat is given by vec cross x_max, where x_max is the maximum variance eigenvector
    					x_hat - max variance eigenvector always lies in x-z plane
    					Uses this system by default unless /efa is set or "vec2" is input
    				b) Two vec - input "vec" and "vec2"
    					z-hat is direction of "vec"
    					y-hat = (vec x vec2)/|vec2 x vec|
    					x-hat = (y-hat x vec)/|vec x y-hat|  (vec2 is in x-z plane)
    					Uses this if "vec2" is set
             ***Can be used to define a radial, azimuthal, Bo coord system with
               vec = Bo
               vec2 = r  (radial direction)
             So,  z-hat ~ Bo
                  y-hat ~ (Bo x r)        (azimuthal)
                  x-hat ~ (y-hat x Bo)    (radial)

    				c) EFA - similar to Two Vec, but doesn't require an additional input vector.
             Instead uses the input x-hat (i.e. [1,0,0])
    					z-hat is direction of "vec"
             and x-z plane consists of Vec and [1,0,0]
    					Uses this if /efa is set

     INPUT: Tplot variable names of:
           waveform -> Name of tplot variable of [m,3] or [3] waveform data. Note that if the
    					Min var rotation is requested then must input a [m,3] where m>1
    	vec   -> [3] element vector OR name of tplot variable
    	         containing [n,3] element vector to represent the z-hat direction. Ex.
    					Bo in the coord system of "waveform".
    					Note that the coordinates of
    					"vec" and "waveform" must be
    					the same!
                                           Also note that m != n necessarily

(See general/missions/rbsp/efw/utils/rbsp_rotate_field_2_vec.pro)

## RBSP_SAMPLE_RATE

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     NAME: rbsp_sample_rate.pro
     SYNTAX:
     PURPOSE: Determines the sample rate of an input time series of data with the
                     ability to set gap thresholds to avoid including them in the
                     calculation.
     INPUT: time :  [N]-element array of time series times
     OUTPUT:
     KEYWORDS:
                   GAP_THRESH   :  Scalar defining the maximum data gap [s] allowed in
                                     the calculation
                                     [Default = MAX(TIME) - MIN(TIME)]
                   AVERAGE      :  If set, routine returns the scalar average sample rate
                                     [Default = 0, which returns an array of sample rates]
                   OUT_MED_AVG  :  Set to a named variable to return the median and average
                                     values of the sample rate if the user wants all values
                                     as well
     HISTORY:  ;   CREATED:  03/28/2012  Lynn B. Wilson III

     NOTES:
                   1)  The output is the sample rate in [# samples per unit time]
                   2)  If GAP_THRESH is set too small, then the returned result is a

     VERSION:
       $LastChangedBy: aaronbreneman $
       $LastChangedDate: 2014-10-15 12:38:05 -0700 (Wed, 15 Oct 2014) $
       $LastChangedRevision: 15997 $
       $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/rbsp_sample_rate.pro $

(See general/missions/rbsp/efw/utils/rbsp_sample_rate.pro)

## TPLOT_ZOOM (PROCEDURE)

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     NAME:
       tplot_zoom (procedure)

     PURPOSE:
       This is basically a wrapper of some of the functions of tlimit and timebar.

     CATEGORY:
       Widget

     CALLING SEQUENCE:
       tplot_zoom, reset = reset, horizontal = horizontal

       Use following calls to change the styles of time bars and y-bars (horizontal
       bars).

         tplot_zoom_set_ybar, linestyle = linestyle, color = color, $
           thick = thick, reset = reset
         tplot_zoom_set_tbar, linestyle = linestyle, color = color, $
           thick = thick, reset = reset

     KEYWORDS:
       /reset: In, optional
             If set, the common block tplot_zoom_com will be reset.
       /horizontal: In, optional
             If set, the shape of the widget will be a horizontal bar.

     INPUTS:
       None.

     SEE ALSO:
       tplot, tlimit, ctime, timebar

     MODIFICATION HISTORY:
       2011-09-06: Created by Jianbao Tao (JBT) at CU/LASP for REE, JBT's PhD
                   advisor, to demo tplot capabilities in a MMS meeting.
       2012-06-15: JBT, CU/LASP.
             1. Updated the documentation header.
             2. Cleaned the code.
       2012-06-26: JBT, CU/LASP. (Obsolete comment. JBT, 2012-10-31)
             1. Added more comments.
             2. Replaced 'Zoom In', 'Zoom Out', 'Pan Forward', and 'Pan Backward'
                buttons with ' + + ', '  +  ', '  -  ', ' - - ', ' < < ', '  <  ',
                '  >  ', and ' > > ' buttons.
             3. Added the 'Full Time Span' and 'Add Time Bar(s)' buttons.
       2012-10-31: JBT, SSL/UCB. Initial release in TDAS.
       2013-06-20: JBT. Fixed a bug when tplot options do not include the window
                   option.

     VERSION:
     $LastChangedBy: jianbao_tao $
     $LastChangedDate: 2013-06-20 08:46:53 -0700 (Thu, 20 Jun 2013) $
     $LastChangedRevision: 12558 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/tplot_zoom.pro $

(See general/missions/rbsp/efw/utils/tplot_zoom.pro)

## TPLOT_ZOOM_COM

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     NAME:
       tplot_zoom_com

     PURPOSE:

    ; Below is IDL code
    ommon tplot_zoom_com, tbar, ybar, trange_stack, yzoom_vars, base

(See general/missions/rbsp/efw/utils/tplot_zoom_com.pro)

## [6]

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     NAME:

     PURPOSE:
       Retrieve a list of files on a remote directory accessible via http.

     CATEGORIES:
       Utilities

     CALLING SEQUENCE:
       result = jbt_fileurls(remote_dir, verbose = verbose)

         remote_dir must a valid http directory, such as:
         http://themis.ssl.berkeley.edu/data/rbsp/teams/spice/mk/

     ARGUMENTS:
       remote_dir: (In, required) See above.

     KEYWORDS:
       verbose: Set this keyword to 0 if one wants to suppress verbose screen
             output.

     COMMON BLOCKS:

     EXAMPLES:

     SEE ALSO:

     HISTORY:
       2012-10-27: Created by Jianbao Tao (JBT), SSL, UC Berkley.
       2012-11-02: Initial release to TDAS.

     VERSION:
     $LastChangedBy: jimm $
     $LastChangedDate: 2016-04-29 11:59:00 -0700 (Fri, 29 Apr 2016) $
     $LastChangedRevision: 20979 $
     $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/general/missions/rbsp/efw/utils/jbt_fileurls.pro $

(See general/missions/rbsp/efw/utils/jbt_fileurls.pro)