Undefined function 'imgradientxy' for input arguments of type 'uint8'.

Hello, I am trying simple example for imgradient:

I=imread('Gray.png');
[Gx, Gy] = imgradientxy(I);
[Gmag, Gdir] = imgradient(Gx, Gy);

figure, imshow(Gmag, []), title('Gradient magnitude')
figure, imshow(Gdir, []), title('Gradient direction')
title('Gradient Magnitude (Gmag) and Gradient Direction (Gdir) using Sobel method')
figure; imshowpair(Gx, Gy, 'montage'); axis off;
title('Directional Gradients, Gx and Gy, using Sobel method');

but it gave this error:

   Undefined function 'imgradientxy' for input arguments of type 'uint8'.

I am using Matlab (R2011b) and as I heard that these functions are new. How can solve this problem?

Answer 1

[Image Analyst]

Easy. Just upgrade. It worked fine for me with R2013a.

[KaMu]

Updating Matlab doesn't seems an easy process, thanks anyway Image Analyst for your reply.

[Image Analyst]

I'm going to do it tomorrow. I'll let you know.