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Hi everyone. I want to create a new matrix using a rand function and the values of other matrix.

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João Narciso
João Narciso 2016-5-4
评论： dpb 2016-5-4
I have a matrix (n,2) that have in the first column the min values and in the second column the max values. I want to create a new matrix (n,100) with uniform distributions in each row using the rand function and picking as MIN value the first value and as MAX value the second value from each row related to the matrix (n,2). In my code it always get the error "Size inputs must be scalar" in the the rand function.
Code:
p=length(t);
ii=1;
pdf=[];
while ii<=p
IMIN=t(ii,1);
IMAX=t(ii,2);
pdf=rand([IMIN IMAX],p,100);
ii=ii+1
end

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采纳的回答

dpb
dpb 2016-5-4
IMIN=t(:,1);
IMAX=t(:,2);
pdf=bsxfun(@plus,IMIN,bsxfun(@times,(IMAX-IMIN),rand(p,100)))
You can dispense with the intermediary IMIN/IMAX arrays in place of t, of course, used simply for legibility to aid in seeing the solution logic.

更多回答（1 个）

Kevin
Kevin 2016-5-4
Are you thinking about generating uniformly distributed random integers? If yes, then you need to replace rand with randi in your code.
  1 个评论
dpb
dpb 2016-5-4
Good point -- if that's the case, the following may be more suitable--
pdf=cell2mat(arrayfun(@(imn,imx,p) randi([imn imx],1,p), ...
IMIN,IMAX,'uniformoutput',false));
will, however.

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