I> itself. In most cases factor should
lie in the interval (.1,100.). 100. is a generally recommended
value.
<P>
<I>nprint</I> is an integer input variable that enables controlled
printing of iterates if it is positive. In this case, fcn is called
with <I>iflag</I> = 0 at the beginning of the first iteration and
every <I>nprint</I> iterations thereafter and immediately prior to
return, with <I>x</I> and <I>fvec</I> available for printing. If
<I>nprint</I> is not positive, no special calls of fcn with
<I>ifl