| FreeMat
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Section: Sparse Matrix Support
Returns a sparse float matrix with ones where the argument matrix has nonzero values. The general syntax for it is 
y = spones(x)
 where x is a matrix (it may be full or sparse). The output matrix y is the same size as x, has type float, and contains ones in the nonzero positions of x. 
Here are some examples of the spones function
--> a = [1,0,3,0,5;0,0,2,3,0;1,0,0,0,1] a = 1 0 3 0 5 0 0 2 3 0 1 0 0 0 1 --> b = spones(a) b = 1 1 1 1 2 1 1 3 1 1 4 1 1 5 1 --> full(b) ans = 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0