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Re: alternative to conv command
Posted:
Apr 29, 2011 5:27 PM


Hi,
thanks for your reply. your filter length is 3 whereas mine is 2048. I think thats the problem.
ImageAnalyst <imageanalyst@mailinator.com> wrote in message <8261b8bb1abe415fba090acc595aaa00@z13g2000yqg.googlegroups.com>... > On Apr 29, 3:08 pm, "Balachander Narasimhan" > <balxxxxxch...@whatever.com> wrote: > > Hi, > > > > thanks for the reply. I am quite sure it is conv command. I step through the code and it takes 1min and 14s for a sequence of length 2048e3 in a 1.2 GHz cpu. Do you think this is resonable? >  > Here's what I get when running it several times on this not > particularlylarge array: > data = rand(1,2048000); > tic > smoothedData = conv(data, ones(3,1)/3); > toc > > > Elapsed time is 0.044840 seconds. > Elapsed time is 0.054861 seconds. > Elapsed time is 0.048844 seconds. > Elapsed time is 0.046158 seconds. > or about 2000 times faster than what you're getting. What exactly are > you doing such it it's so slow? > Elapsed time is 0.063725 seconds. > Elapsed time is 0.048575 seconds. > Elapsed time is 0.042594 seconds.



