a newbe question ---- divide inconsistancies between 591 and 592
Subject: a newbe question ---- divide inconsistancies between 591 and 592
From: Robert Dodier
Date: Fri, 28 Oct 2005 11:27:30 -0600
Hi Doug,
> Using the code given latter, I get different results from 5.9.1 and 5.9.2.
> The difference is in the results of the divide function. In 5.9.1 the
> results are ordered in powers of "s" which is what you would expect but
> 5.9.2 does not do this. How do I force 5.9.2 to order the polynomial in
> power of "s"?
Without investigating I'll guess that the ordering of terms is different
between 5.9.1 and 5.9.2 due to code changes in 5.9.2 to enable
case sensitivity.
My advice is to collect terms for powers of s or whatever using
functions, instead using part (expr, n) which relies on a specific
ordering of the results.
Try facsum (expr, 1, s, s^2) followed by coeff (%, s^2) to collect
the s^2 terms. See also isolate and disolate.
Sorry I can't be more helpful,
Robert Dodier