function x = postpad (x, L, varargin)
%POSTPAD Pads or truncates a vector x to a specified length L.
% Usage: y=postpad(x,L);
% y=postpad(x,L,C);
% y=postpad(x,L,C,dim);
%
% `postpad(x,L)` will add zeros to the end of the vector *x*, until the
% result has length *L*. If *L* is less than the length of the signal, it
% will be truncated. `postpad` works along the first non-singleton
% dimension.
%
% `postpad(x,L,C)` will add entries with a value of *C* instead of zeros.
%
% `postpad(x,L,C,dim)` works along dimension *dim* instead of the first
% non-singleton.
%
% See also: middlepad
% AUTHOR : Peter L. Søndergaard.
% TESTING: OK
% REFERENCE: NA
if nargin<2
error('Too few input parameters.');
end
definput.keyvals.dim = [];
definput.keyvals.C = 0;
[~,~,C,dim] = ltfatarghelper({'C','dim'},definput,varargin,'postpad');
[x,L,Ls,W,dim,permutedsize,order]=assert_sigreshape_pre(x,L,dim,'POSTPAD');
if Ls<L
x=[x; C*ones(L-Ls,W)];
else
x=x(1:L,:);
end
x=assert_sigreshape_post(x,dim,permutedsize,order);