ttp://guillaumemaze.googlecode.com/svn/trunk/matlab/codes/matrix/mywkeep.m">Download here</a>
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                  <br>% MYWKEEP Keep part of a vector or a matrix.<br>%   For a vector:<br>%   Y = WKEEP(X,L,OPT) extracts the vector Y <br>%   from the vector X. The length of Y is L.<br>%   If OPT = 'c' ('l' , 'r', respectively), Y is the central<b