what is vlfeat and how made available it?

i use a code in this address for background subtraction http://www.mathworks.com/matlabcentral/fileexchange/34077-background-removal-using-gaussian-model but in this code it use an function named vl_kmeans but when i open this file it is command code and do not have any code this function is in VLFEATROOT folder do you know what is the problem? and what is vlfeat how can i made available it?

Answer 1

[Wayne King]

Where do you see that function called in that submission. I don't happen to see that function used anywhere. What am I missing?

[nadia naji]

ok i install matlab on drive d but some file are in drive c so it retrive function wrongly. thanks