Problem writing built in code for Fast Fourier Transform

Hello! I try to write my own built in code for Fast Fourier Transform to processed image with strong diagonal line with fftshift function

function out = myfft2(im,dim1,dim2,logflag)

if nargin==1
    logflag = 1;
    [dim1,dim2] = size(im);
elseif nargin==2
    logflag = dim1;
    [dim1,dim2] = size(im);
elseif nargin==3
    logflag = 1;
end

if logflag
    out = fftshift(log(abs(fft2(double(im),dim1,dim2))));
else
    out = fftshift(abs(fft2(double(im),dim1,dim2)));
end

imshow(out,[])

After I have computed, it returned with errors:

>> myfft
Not enough input arguments.

Error in myfft (line 13)
if logflag

I still cannot figure out which part I did wrong :((

Answer 1

[Walter Roberson]

Your myfft2() code is written expecting at least one argument to be passed in the call, but you are not passing any argument. What is your expectation on how the value for "im" is going to be found?