Finding pixels that meet specific criteria

Below is an image of `cameraman.tif` that comes with matlab but after applying fuzzy c-means: http://www.mathworks.com/matlabcentral/fileexchange/25532-fuzzy-c-means-segmentation

Image:

https://www.dropbox.com/s/xohl4i5earnxht8/fuzzysegmented.jpg?n=13215274

Also, as an output from the algorithm is `u2` (degree of membership of a pixel) is "matlab.mat": https://www.dropbox.com/s/53u5k9qntx5lchc/matlab.mat?n=13215274

What I want to do is select the pixel(s) from the image attached whose `u2` value is `equal to 1`.

Any ideas on how this can be done in `matlab`?

Thanks.