Re: Mathematica v5 versus v6
- To: mathgroup at smc.vnet.net
- Subject: [mg80080] Re: Mathematica v5 versus v6
- From: Helen Read <hpr at together.net>
- Date: Sun, 12 Aug 2007 07:13:23 -0400 (EDT)
- References: <f9jjnc$2i8$1@smc.vnet.net>
Jon wrote: > Hi > > I have found that there are some simple problems which can be done > quickly in v5 but the new v6 seemingly cannot. > > For example I am presently doing some work which requires the > calculation of the Rank of an 8 by 8 matrix. Using my notebook, 1Gb RAM > and 1.73GHz with v5.1, I get the answer in a few seconds. When I > installed v6 and ran the same nb file I never got an answer even after > running for 1 hour. > > Is there a bug in v6? > > If others are also running v6 I would be interested in getting in > touch to see if other users have the same experience. If you are running > on a 64 bit machine I would really like to see if that solves the > problem and can give an answer with v6. It would help if you would post a specific example. I just now tried computing the MatrixRank on some matrices of random integers, and it was pretty much instantaneous for an 8 by 8 matrix, and took less than a second for a 100 by 100 matrix. This is on a 5-year-old Pentium 4 (2 GHz, 512 MB RAM). -- Helen Read University of Vermont