Xivanki Share !!: Matlab Trick: Counting via Sparse

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Here is a simple little matlab demo script of how to count items using the command sparse. Counting the occurrences of items is a frequently performed task in vision and not many people know that sparse can do this. Remember, if you're going to be a matlab jedi do not write for loops:

	function count_with_sparse
	%Find item co-occurences using sparse
	%Tomasz Malisiewicz
	item1 = [1 3 1 4 3];
	item2 = [2 2 2 1 2];
	N = 4;
	counts = sparse(item1,item2,1,N,N)
	imagesc(full(counts))
	title('Counts using Sparse')

view raw count_with_sparse.m hosted with ❤ by GitHub

I am using github's gists to embed this code in style. Github lets me choose the language, highlights the syntax accordingly, and the snippet is its own repository!