Smooting
in [Matlab]
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From: Chad on 18 Jun 2010 15:56 I have a data set that I want to smooth. I would like to take the every ten points and add sum them to make one point. I am unable to find a function that does this. Essentially I would like to decimate my data set but sum the points in between. Any suggestion would be helpful.
From: us on 18 Jun 2010 16:18 "Chad " <cforrest(a)pas.rochester.edu> wrote in message <hvgj0k$mtp$1(a)fred.mathworks.com>... > I have a data set that I want to smooth. I would like to take the every ten points and add sum them to make one point. I am unable to find a function that does this. Essentially I would like to decimate my data set but sum the points in between. Any suggestion would be helpful. a hint: help reshape; help sum; us
From: Dave Robinson on 19 Jun 2010 13:03 "us " <us(a)neurol.unizh.ch> wrote in message <hvgk9s$emr$1(a)fred.mathworks.com>... > "Chad " <cforrest(a)pas.rochester.edu> wrote in message <hvgj0k$mtp$1(a)fred.mathworks.com>... > > I have a data set that I want to smooth. I would like to take the every ten points and add sum them to make one point. I am unable to find a function that does this. Essentially I would like to decimate my data set but sum the points in between. Any suggestion would be helpful. If you have the Signal Processing Toolbox, then help resample will give you a very nice solution to your problem, although the 'smoothing' or lowpass filtering is done using a much more sophisticated filter than your simple block average technique. Regards Dave Robinson
From: John on 19 Jun 2010 15:06 if x is a row vector which has a length that is a multiple of 10, then: sum(reshape(x',10,length(x)/10)) "Chad " <cforrest(a)pas.rochester.edu> skrev i meddelelsen news:hvgj0k$mtp$1(a)fred.mathworks.com... >I have a data set that I want to smooth. I would like to take the every >ten points and add sum them to make one point. I am unable to find a >function that does this. Essentially I would like to decimate my data set >but sum the points in between. Any suggestion would be helpful.
From: Matt J on 19 Jun 2010 15:42 "Chad " <cforrest(a)pas.rochester.edu> wrote in message <hvgj0k$mtp$1(a)fred.mathworks.com>... > I have a data set that I want to smooth. I would like to take the every ten points and add sum them to make one point. I am unable to find a function that does this. Essentially I would like to decimate my data set but sum the points in between. Any suggestion would be helpful. ============= For large sparse data sets, downsample by matrix multiplication: >> Data=sprand(100000,100000,.0001); >> N=10; %downsample factor >> A=kron(speye(size(Data,1)/N),ones(1,N)/N); %downsample matrix; >> result=A*Data;
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