Finding a circle in an image without using Imfindcircles function?

Hello, I'm using Matlab10a, but it doesn't have imfindcircles function. Is there any way for me to find a circle in an image without using that particular function? Thank you ^^

Answer 1

[Walter Roberson]

http://www.mathworks.com/matlabcentral/fileexchange/9168-detect-circles-with-various-radii-in-grayscale-image-via-hough-transform