Re: Dot product confusion
- To: mathgroup at smc.vnet.net
- Subject: [mg109942] Re: Dot product confusion
- From: Alois Steindl <Alois.Steindl at tuwien.ac.at>
- Date: Wed, 26 May 2010 07:07:03 -0400 (EDT)
- References: <htg90l$k7h$1@smc.vnet.net>
Hello, your assumptions seem to be wrong. The dot product in Mathematica isn't just "the inner product, but the matrix product, in your case ptsa*v or v*ptsa. In the first case v is considered as column vector, in the second one as row vector. Matrix products are rarely abelian. Alois -- Alois Steindl, Tel.: +43 (1) 58801 / 32558 Inst. for Mechanics and Mechatronics Fax.: +43 (1) 58801 / 32598 Vienna University of Technology, A-1040 Wiedner Hauptstr. 8-10