error in betarnd function

Question

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I am using betarnd to generate beta distributed samples. However, sometimes the following error occurs.

" ??? Error using ==> binornd at 31 Size information is inconsistent.

Error in ==> betarnd at 44 r(t) = binornd(1,p,sum(t(:)),1); "

For example, using this line of code would sometimes produce the above error: betarnd([0.0001 0.0001 1],[0.0001 0.0001 1]).

Should line 44 of betarnd.m be "r(t) = binornd(1,p,1,sum(t(:)));" instead of "r(t) = binornd(1,p,sum(t(:)),1);"?

Thanks for your help.

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Answer 1

Shashank Prasanna 2013-2-26

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This is indeed a bug in betarnd which existed in releases prior to MATLAB R2011a.

If you are using an older release you are right about the fix as well.

>> edit betarnd

and replace Line 44 with

>> r(t) = binornd(1,p(:),sum(t(:)),1);