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AppendColumns

  AppendColumns appends a 2D matrix to an existing 2D matrix in a MAT-file

  Example:
  AppendMatrix(FILENAME, VARNAME, NEWDATA)

  FILENAME is a string with the name of the file (which should be a v6
  MAT-file).
  VARNAME is a string with the name of the target variable.
  NEWDATA is a column vector or 2D matrix containing the data to add to
  VARNAME

  AppendColumns horizontally concatenates the contents of VARNAME and
  NEWDATA

  Restrictions: VARNAME must be the name of the final variable in FILENAME.
  NEWNAME and VARNAME must have the same number of rows. The class of 
  VARNAME on disc must be the same as NEWNAME (use RestoreDiscClass 
  after a MATLAB save call,) and both must be real valued. 

  AppendColumns produces an identical result to the more general
  AppendMatrix which may be used with higher dimensions matrices
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  This program is distributed without any warranty,
  without even the implied warranty of fitness for a particular purpose.
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  Author: Malcolm Lidierth 11/06
  Copyright © The Author & King's College London 2006
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