Path: news.mathworks.com!not-for-mail From: "ghasem " <shaban_sadeghi@yahoo.com> Newsgroups: comp.soft-sys.matlab Subject: Re: MTIMESX when Inner matrix dimensions are not agree. Date: Thu, 18 Apr 2013 12:28:09 +0000 (UTC) Organization: The MathWorks, Inc. Lines: 19 Message-ID: <kkoosp$a0m$1@newscl01ah.mathworks.com> References: <kkn6k2$64$1@newscl01ah.mathworks.com> <kko2ie$bm2$1@newscl01ah.mathworks.com> <kko531$hv7$1@newscl01ah.mathworks.com> <kko8ji$qlk$1@newscl01ah.mathworks.com> <kkohgh$jqm$1@newscl01ah.mathworks.com> Reply-To: "ghasem " <shaban_sadeghi@yahoo.com> NNTP-Posting-Host: www-04-blr.mathworks.com Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Trace: newscl01ah.mathworks.com 1366288089 10262 172.30.248.35 (18 Apr 2013 12:28:09 GMT) X-Complaints-To: news@mathworks.com NNTP-Posting-Date: Thu, 18 Apr 2013 12:28:09 +0000 (UTC) X-Newsreader: MATLAB Central Newsreader 4223132 Xref: news.mathworks.com comp.soft-sys.matlab:793816 > No you didn't, since you ask about "matrix dimension must agree" error. > > And you start over again with mmx. > > Bruno ================================= yes,I know,but you don't understand my question. in fact,my question was as follow: if I want to use from MTIMESX for fast opertaion,but second dimension of A is not equal with first diemnsion of B,but second and third dimensions in both A and B are same,is a good choice MTIMESX? for example: a=rand(33,32,32); b=rand(33,32,32); I konw that : c = mtimesx(a,b) => is false! also,I know that simply : c =a.*b but I want to use from: c = permute(mtimesx(permute(a,[2 3 1]),permute(b,[2 3 1])),[3 1 2]); NOW,my question was: between " .* " operator and " mtimesx (or mmx)" , which is faster? ghasem