% 
% Usage:   Z =mexCalcXtY(X,Y);
%
% Name: mexCalcXtY
%
% Description: Compute Z=X'Y using the BLAS library used by SPAMS.
%
% Inputs: X:  double n x m matrix
%         Y:  double n x p matrix   
%
% Output: Z: double m x p matrix 
%
% Author: Julien Mairal, 2009


