Error using vertcat Dimensions of matrices being concatenated are not consistent

function [xt,time]=IFFT_oversampling(X,N,L)

% Zero-padding & NL-point IFFT

% => N-point IFFT & interpolation with oversampling factor L

if nargin<3, L=1; end % Virtually, no oversampling

NL=N*L; T=1/NL; time = [0:T:1-T]; X = X(:);

xt = L*ifft([X(1:N/2) zeros(1,NL-N) X(N/2+1:end)], NL);

T = [ I(1:2:n-1), I(2:2:n)];

Can anybody help me, cant understand why do i get this error when i run it?

i have attached written the function above.

thanks

Answer 1

[Star Strider]

Since you have defined ‘X’ as a column vector, you likely need to vertically concatenate the ifft arguments in ’xt’ instead of horizontally concatenating them:

xt = L*ifft([X(1:N/2); zeros(NL-N,1); X(N/2+1:end)], NL);

Note the use of semicolons (;) to do the vertical concatenation, as well as defining the zeros call to produce a column vector by re-arranging its arguments.

The next problem is that ‘I’ is undefined. You need to figure out what you want it to be, keeping in mind that ‘T’ will work if it is a row vector and may not work not if ‘I’ is a column vector.

I leave those to you.