<A NAME=ROUNDBF>
<TITLE>ROUNDBF</TITLE></A>
<b><a href=r37_idx.html>INDEX</a></b><p><p>
<B>ROUNDBF</B> _ _ _ _ _ _ _ _ _ _ _ _ <B>switch</B><P>
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When
<A HREF=r37_0330.html>rounded</A> is on, the normal defaults cause underflows to
be
converted to zero. If you really want the small number that results in
such cases, <em>roundbf</em> can be turned on.
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<P> <H3>
examples: </H3>
<P><PRE><TT>
on rounded;
exp(-100000.1^2);
0
on roundbf;
exp(-100000.1^2);
1.18441281937E-4342953505
</TT></PRE><P>If a polynomial is input in
<A HREF=r37_0330.html>rounded</A> mode at the default
precision into any
<A HREF=r37_0438.html>roots</A> function, and it is not possible to
represent any of the coefficients of the polynomial precisely in the
system floating point representation, the switch <em>roundbf</em> will be
automatically turned on. All rounded computation will use the internal
bigfloat representation until the user subsequently turns <em>roundbf</em>
off. (A message is output to indicate that this condition is in effect.)
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