sprand — sparse random matrix
sp=sprand(nrows,ncols,fill [,typ])
integer (number of rows)
integer (number of columns)
filling coefficient (density)
character string ('uniform' (default) or
'normal')
sparse matrix
sp=sprand(nrows,ncols,fill) returns a sparse
matrix sp with nrows rows,
ncols columns and approximately
fill*nrows*ncols non-zero entries.
If typ='uniform' uniformly distributed values on
[0,1] are generated. If typ='normal' normally
distributed values are generated (mean=0 and standard deviation=1).