Can I randomly sample from a csv file?

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Sarah E
Sarah E 2014-8-21
回答： Image Analyst 2014-8-21
Hi, I have a .csv file of 1000000 values, I want to randomly sample x amount of values from this without repetition. is this possible and how would I do it? It seems the randsample function does not work in this way.

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Image Analyst
Image Analyst 2014-8-21
Read the matrix into a variable with csvread(). Then get random samples with randperm():
myData = csvread(filename);
numberToGet = 1000; % or whatever number you want.
randomLocations = randperm(numel(myData), numberToGet)
randomlySelectedValues = myData(randomLocations); % Uses linear indexing into a 2D matrix.

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