Use numbers in a matrix to call vector row

Question

Christopher 2014-9-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/156820-use-numbers-in-a-matrix-to-call-vector-row

回答： Michael Haderlein 2014-9-30

I have the code

prand =  rand(100,100);
P     =  1+round(prand*999);
P2    =  P(samparray,1); % this part doesn't work

where samparray is a 1000x1 array of numbers

So we have a matrix P of randomly generated integers (between 1 and 1000). Each number in P corresponds to a row in samparray, and I want P2 to return the corresponding values in samparray into the form of matrix P. How can I modify P2 to do this?

Thanks

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Answer 1

Michael Haderlein 2014-9-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/156820-use-numbers-in-a-matrix-to-call-vector-row#answer_153363

在 MATLAB Online 中打开

P2=P(samparray);

should work.

1+round(prand*999) isn't the best way to get randomly distributed integers between 1 and 1000 as the probability of 1 and 1000 (the limits) is lower than for the other values. Better would be 1+fix(prand*1000) or randi(1000,100,100).