Use numbers in a matrix to call vector row

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Christopher
Christopher 2014-9-30
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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Michael Haderlein
Michael Haderlein 2014-9-30
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).

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