SPONES  SPONES Sparse Ones Function


Usage
 
 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.
 