sited
in the return argument <CODE>pointslog</CODE>.  If <CODE>options(1)</CODE> is set to 0,
then only warning messages are displayed.  If <CODE>options(1)</CODE> is -1,
then nothing is displayed.

<p><CODE>options(2)</CODE> is the precision required for the value
of <CODE>x</CODE> at the solution. If the absolute difference between
the values of <CODE>x</CODE> between two successive steps is less than
<CODE>options(2)</CODE>, then this condition is satisfied.

<p><CODE>options(3)</CODE> is the precision r