Error using .* Matrix dimensions must agree.

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function [ ] = fftshow(f)
f1=log(1+abs(f)); fm=max(f1(:)); figure, imshow(im2uint8(f1/fm));
function [ ] = ifftshow( f )
f1=abs(f); fm=max(f1(:)); figure,imshow(f1/fm);
main program:
clc; clear all; close all;
a=imread('cameraman.jpg'); figure,imshow(a);
af=fftshift(fft2(a)); figure,imshow(af);
[x,y]=meshgrid(-128:127,-128:127); z=sqrt(x.^2+y.^2); c=z<15;
af1=af.*c; fftshow(af1)
i got an error as
Error using .* Matrix dimensions must agree.
Error in fftlpf (line 18) af1=af.*c;
can anyone help me in this regard

Accepted Answer

Mike Hosea
Mike Hosea on 7 Nov 2014
Edited: Mike Hosea on 8 Nov 2014
The size of af is the image size. The size of c is 256-by-256. I'm guessing your image is not 256-by-256. If not, what were you expecting af.*c to do? Then we'll see if we can figure out how to do that.

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