Re: Why does Inverse[M] hesitate?

*To*: mathgroup at smc.vnet.net*Subject*: [mg54383] Re: Why does Inverse[M] hesitate?*From*: skirmantas.janusonis at yale.edu (Skirmantas)*Date*: Sat, 19 Feb 2005 02:32:57 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

The Inverse function sometimes calculates the inverse of a matrix immediately, sometimes it does not. Try this example in Mathematica 5.1: A={{(1-g)-1,1},{-w P(1-g)/C,-1}}//MatrixForm B={{0},{-P(w+1)}}//MatrixForm I get Out: Inverse[(expanded A)].(expanded B) If I do just A={{a,b},{c,d}} B={{e},{f}} Inverse[A].B I get the final correct result.

**Follow-Ups**:**Re: Re: Why does Inverse[M] hesitate?***From:*DrBob <drbob@bigfoot.com>

**Re: Re: Why does Inverse[M] hesitate?***From:*Andrzej Kozlowski <akoz@mimuw.edu.pl>