I think the MatLab excluded the time for the random number generation. Look closely at the posted code. Also, the J code "jumbo" did include the 1000 repetitions of the matrix multiply.
----- Original Message ----- From: Randy MacDonald <[EMAIL PROTECTED]> Date: Thursday, November 8, 2007 12:00 Subject: Re: [Jprogramming] speed of matrix*vector operation. To: Programming forum <[email protected]> > Let's be fair; I don't think the Matlab guy excluded the random number > generation. The 1000 (or was it 1001?) repetitions of the matrix > multiply should also be in the J expression, something I don't think > I've seen. As far as I can see, the execution speedup of Matlab doesn't > cover the extra time it takes to type in the Matlab code, assuming there > are no typos in that long piece of Matlab. > > Roger Hui wrote: > > You should exclude the time needed to generate the random numbers. > > > > > > > > ----- Original Message ----- > > From: Devon McCormick <[EMAIL PROTECTED]> > > Date: Thursday, November 8, 2007 10:30 > > Subject: Re: [Jprogramming] speed of matrix*vector operation. > > To: Programming forum <[email protected]> > > > > > >> 6!:2 '(?256$0)*"1]?312 256$0' > >> 0.121752 > >> > >> On 11/8/07, Michael Dykman <[EMAIL PROTECTED]> wrote: > >> > >>> On Nov 8, 2007 1:13 PM, <[EMAIL PROTECTED]> wrote: > >>> > >>>> I told my friend about how nice J was. Am I wrong? ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
