error using contour function

I am currently getting an error using the contour function. My code is [c,h] = contour(u,[0 0],'r'); where u is a matrix 512 by 512. The code runs fine on my friends computer. I have reinstalled MATLAB but the error is still there. Please help!

??? Error using ==> contours
Too many input arguments.

Error in ==> specgraph.contourgroup.refresh at 180
                [this.contourmatrix,msg] = contours(x,y,z,levels);

Error in ==> specgraph.contourgroup.schema>LdoDirtyAction at 265
        refresh(h);

Warning: Error occurred while evaluating listener callback. 
> In contour at 88
  In geodesics at 27

Answer 1

[Wayne King]

It looks like you are actually calling an undocumented function from the Signal Processing Toolbox, contours()

u = randn(512,512);
[c,h] = contour(u,[0 0],'r');

should work.

Are you sure you don't have a typo in your code where you are actually calling contours?

[Steve Birks]

If I run your code:

>> u = randn(512,512);

[c,h] = contour(u,[0 0],'r');

??? Error using ==> contours

Too many input arguments.

Error in ==> specgraph.contourgroup.refresh at 180

[this.contourmatrix,msg] = contours(x,y,z,levels);

Error in ==> specgraph.contourgroup.schema>LdoDirtyAction at 265

refresh(h);

Warning: Error occurred while evaluating listener callback.

> In contour at 88

[Walter Roberson]

Carlos was able to resolve this on his system; see http://www.mathworks.co.uk/matlabcentral/answers/59347-problems-with-contour-function-it-doesn-t-work-even-matlab-s-examples

Answer 2

[Carlos G-M]

I have the same problem Steve, any solution? Thanks