Re: Error: subscript indices must be either positive integers or logicals - For simple surf plot

[indium]

On Thu, Nov 24, 2011 at 01:33:27PM -0800, jammydav93 wrote:
> Hi,
> 
> I'm trying to make a function which plots the values of C from A and B
> 
> My function is simply:
> 
> 
> 
> function f(g)
> 
> for a=0:pi
>       for b=0:pi
>       
> c(a,b)=tan(g*a) * arcsin(g*b);
> 
>       end
> end
> 
> surf(c);
> 
> 
> The function works when I start the loops from 1, however I need the loops
> to start at 0, when I start the loops at 0 I get the error "subscript
> indices must be either positive integers or logicals."
> 
> Anybody know how I can solve this?
> 
> Thanks
> 
> L
> 
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Please realize that a=0:pi will give a the values {0,1,2,3} and so
there is not 3.1415... = pi value ever assigned to 'a'. In your case you
could as well run over a=0:3 .

As the error message said: you are using 'a' as a index value of a
matrix or a vector.  Those index values always start at 1, not 0.