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<p>
<pre>
 Purpose   
   =======</pre><p>
<pre>   SLANGS returns the value of the one norm, or the Frobenius norm, or 
   the infinity norm, or the element of largest absolute value of a 
   real matrix A.</pre><p>
<pre>   Description   
   ===========</pre><p>
<pre>   SLANGE returns the value</pre><p>
<pre>      SLANGE = ( max(abs(A(i,j))), NORM = 'M' or 'm'   
               (   
               ( norm1(A),         NORM = '1