SPRANDN  SPRANDN Sparse Normal Random Matrix


Usage
 
 Creates a sparse matrix with normally distributed random entries (mean 0, sigma 1).  The
 syntax for its use is
 
   y = sprandn(x)
 
 where x is a sparse matrix, where y is a sparse matrix that has
 random entries where x is nonzero.  The second form specifies the
 size of the matrix and the density
 
   y = sprandn(m,n,density)
 
 where m is the number of rows in the output, n is the number of 
 columns in the output, and density (which is between 0 and 1) is
 the density of nonzeros in the resulting matrix.  Note that for very
 high densities the actual density of the output matrix may differ from
 the density you specify.  This difference is a result of the way the
 random entries into the matrix are generated.  If you need a very dense
 random matrix, it is better to generate a full matrix and zero out the 
 entries you do not need.
 