Re: Repeating bug (error: subscript indices must be either positive integers or logicals)

[Przemek Klosowski]

On 04/27/2011 01:59 AM, Mike Ragan wrote:
> I get the following message when I run Passgen:
>
> subscript indices must be either positive integers or logicals.
> error: called from `OnePassword' in file
> C:\Users\Mike\DOCUME~1\2010-11\EG1002\OnePassword.m near line 12,

Octave is complaining about those code lines:

   randomchar = round(rand(1)*62)
   allchar = [uppercase lowercase digits];
   Password(n) = allchar(randomchar);

So your problem occurs when rand(1) is pretty close to zero, 
specifically when it's smaller than 1/62; your randomchar ends up being 
zero which is an illegal index into the allchar array.

You need to make sure that the randomchar index falls within the range 
1..length(allchar), for instance:

randomchar = 1+round(rand(1)*length(allchar))

Fortunately, rand() never returns 1 so we won't get caught on the other 
end of this interval.