Re: CPU time for Solve under v.2.0 and 2.1

*To*: mathgroup at yoda.physics.unc.edu*Subject*: Re: CPU time for Solve under v.2.0 and 2.1*From*: yoda at ele.crl.melco.co.jp*Date*: Tue, 17 Nov 92 15:18:09 JST

Dear Dave, thanks for your prompt reply. Today I did further investigation about LinearSole and Solve for a linear matrix equation solving. A new test matrix is a 8 x 8 sparse symmetric one. Here's my conclusion: (1) v.2.1 always gives much longer expressions than v.2.0 does. In my 8 x 8 matrix case, the length ratio is over 10 fold!!! (2) So even though the CPU time only for Solve and LinearSolve may be a bit faster under v.2.1, the total time including the following Cancel or Simplify operation is much longer under v.2.1. Test results summary v.2.0 -------------------------------- Solve Cancel Total 5 sec 7 sec 12 sec -------------------------------- LinearSolve Cancel Total 6 sec 4 sec 10 sec -------------------------------- v.2.1 -------------------------------- Solve Cancel Total 7 sec too long to wait !! -------------------------------- LinearSolve Cancel Total 3 sec 62 sec 65 sec -------------------------------- Is it possible to use v.2.0's Solve and LinearSolve under v.2.1 Mathematica? The reason is the overall speed of v.2.1 except the Solve or LinearSolve looks much faster! Regards, Kiyoshi *************************************** * Kiyoshi Yoda, Ph.D * * * * Mitsubishi Electric Corporation * * Central Research Laboratory * * 8-1-1 Tsukaguchi-Hommachi * * Amagasaki, 661 Japan * * * * yoda at ele.crl.melco.co.jp * * domestic phone: 06-497-7130 * * domestic fax : 06-497-7288 * * international fax: +81-6-497-7288 * ***************************************