IFFT equation in matlab

Dear all, Let say i have this

 X(2:N,:) = repmat(X(1,:),N-1,1).*Phase_Rot;                             
 x = ifft(X,[],2);                                                    

My question is how can i convert the second line command into ifft equation?

[Wayne King]

I'm not sure what you are trying to do here, are you trying to represent the inverse DFT as a matrix operation, where you multiply a Nx1 vector of DFT values to invert the transform?

[Matt J]

Incidentally, bsxfun would be more efficient

 X(2:N,:) = bsxfun(@times, X(1,:), Phase_Rot);                             
 x = ifft(X,[],2);