\section{SPONES Sparse Ones Function}

\subsection{Usage}

Returns a sparse \verb|float| matrix with ones where the argument
matrix has nonzero values.  The general syntax for it is
\begin{verbatim}
  y = spones(x)
\end{verbatim}
where \verb|x| is a matrix (it may be full or sparse).  The output
matrix \verb|y| is the same size as \verb|x|, has type \verb|float|, and contains
ones in the nonzero positions of \verb|x|.
\subsection{Examples}

Here are some examples of the \verb|spones| function
\begin{verbatim}
--> a = [1,0,3,0,5;0,0,2,3,0;1,0,0,0,1]
a = 
  <int32>  - size: [3 5]
 
Columns 1 to 5
 1  0  3  0  5  
 0  0  2  3  0  
 1  0  0  0  1  
--> b = spones(a)
b = 
  <float>  - size: [3 5]
	Matrix is sparse with 7 nonzeros
--> full(b)
ans = 
  <float>  - size: [3 5]
 
Columns 1 to 5
 1  0  1  0  1  
 0  0  1  1  0  
 1  0  0  0  1  

\end{verbatim}
