upper limits
in [Matlab]
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From: Dafne on 2 Jul 2010 07:24 Hi I would like to know how to solve the following problem with matlab. I have a list of numbers that are upper limits (R) and I would like to know the fractio of upper limits with value R less than a given value R0 I know that I cannot use the simple fractio but the kaplan-maier method. I saw there is ecdf in Matlab but I am unable to apply this to my case. Can you help me thanks Dafne
From: Steven Lord on 2 Jul 2010 09:33 "Dafne " <guetta(a)mporzio.astro.it> wrote in message news:i0ki8k$ggk$1(a)fred.mathworks.com... > Hi > > I would like to know how to solve the following problem with matlab. > I have a list of numbers that are upper limits (R) and I would like to > know the fractio of upper limits with value R less than a given value R0 I > know that I cannot use the simple fractio but the kaplan-maier method. I > saw there is ecdf in Matlab but I am unable to apply this to my case. > > Can you help me thanks Dafne Are you looking for something like: R = 1:10; R0 = 6.5; fraction = nnz(R > R0)./numel(R) NNZ returns the number of nonzero elements in the logical expression R > R0 which is the number of values in R that are strictly greater than R0. Dividing that by NUMEL(R), the total number of elements in R, gives the fraction. If you're looking for something else, you're going to need to give a bit more detail and perhaps a SMALL (say R no more than 20-30 elements) example of what you're trying to achieve. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ To contact Technical Support use the Contact Us link on http://www.mathworks.com
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