sampling pairs of elements

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María Jesús 2015-2-27

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回答： Guillaume 2015-2-28

Hi,

I'm trying to sample data from two vectors simultaneously, one is a population value and the other a point in time. I need to get the data to be sampled as a pair, that is, I need to be able to sample the population and retain the time at which it occurs. Is there a way to do that?

Thanks!

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Stephen23 2015-2-27

http://www.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html

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Answer 1

dpb 2015-2-27

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Select the sample from the indices 1:length(vector) and the use that to select the elements.

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María Jesús 2015-2-28

I'm not sure I understand... could you elaborate?

Guillaume 2015-2-28

编辑：Guillaume 2015-2-28

@dpb, numel is better than length since the latter can return the size of different dimensions with matrices). I'm of the opinion that length should never be used.

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Answer 2

Guillaume 2015-2-28

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在 MATLAB Online 中打开

One simple way:

popvalues = [1  5  8  10 3  6  8  9  10 54 23 1]; %for example
poptimes =  [4  10 16 14 12 18 20 24 22 2  6  8]; %for example
for sample = [popvalues; poptimes]
   %do something with sample
   %...
end