improfile "Error using interp2 Too many input arguments."

when copying the example of the matlab, the line was drawn. But no matter how to finishe the line, shift+click, righ-click, or double-click, when it finishes, it shows the error: "Error using interp2, Too many input arguments. Error in improfile (line 236), zg = interp2(xGridPoints, yGridPoints, img, xg, yg, method);

What's the correct operation to use the improfile and let matlab to plot a line? Thanks.

I = fitsread('solarspectra.fts');
imshow(I,[]);
c=improfile

[Walter Roberson]

What shows up for

which -all interp2

/MATLAB/toolbox/matlab/polyfun/interp2.m
/MATLAB/toolbox/parallel/gpu/@gpuArray/interp2.m            % gpuArray method
/MATLAB/toolbox/parallel/parallel/@codistributed/interp2.m  % codistributed method

I suspect that you have another interp2 before the polyfun one.

[John]

Thanks, I found the function in another package and it worked now. However, I cann't see the "accept the answer" button for this tip :-(