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From: matt reister on 18 Jan 2010 04:08
I have a rather simple matlab script that I am recieving the following error on:
Subscript indices must either be real positive integers or logicals.

size = 10;
x = zeros(size,6);
for i = 0:size
x(i,:) = [i (i +1) (i +2) (i + 3) (i + 4) (i + 5) ];
end

I know the reason I aym recieving the error is because I am using i in the index of the x matrix, but it seems like i should be able to do this.... Does anyone know of a way the index a given row in a for loop like that?
From: Oleg Komarov on 18 Jan 2010 04:36
"matt reister"
> I have a rather simple matlab script that I am recieving the following error on:
> Subscript indices must either be real positive integers or logicals.
>
> size = 10;
> x = zeros(size,6);
> for i = 0:size
> x(i,:) = [i (i +1) (i +2) (i + 3) (i + 4) (i + 5) ];
> end
>
> I know the reason I aym recieving the error is because I am using i in the index of the x matrix, but it seems like i should be able to do this.... Does anyone know of a way the index a given row in a for loop like that?

First of all don't use 'i' but 'ii'. Try to look for 'i' in the help.
Second a matrix is indexed for all elements starting from 1 to end. So the element 0 doesn't exist.
Third: 'i (i +1)' is not a valid expression in matlab. If you're trying to multiply, use the *.
For i = 0 your expression returns 0 (if * is assumed)
so why t start a loop from 0 at all?

And to avoid any loop:
[x,y] = meshgrid(0:5);
x = x+y;
Out = prod(x,2);

Oleg
From: Oleg Komarov on 18 Jan 2010 04:45
"Oleg Komarov"
>
> And to avoid any loop:
> [x,y] = meshgrid(0:5);
> x = x+y;
> Out = prod(x,2);
>
> Oleg
Typo:
replace [x,y] = meshgrid(0:5); with
[x,y] = meshgrid(0:5,0:10);

Oleg
From: Steve Amphlett on 18 Jan 2010 04:50
"matt reister" <mattreister(a)hotmail.com> wrote in message <hj18dj$8a3$1(a)fred.mathworks.com>...
> I have a rather simple matlab script that I am recieving the following error on:
> Subscript indices must either be real positive integers or logicals.
>
> size = 10;
> x = zeros(size,6);
> for i = 0:size
> x(i,:) = [i (i +1) (i +2) (i + 3) (i + 4) (i + 5) ];
> end
>
> I know the reason I aym recieving the error is because I am using i in the index of the x matrix, but it seems like i should be able to do this.... Does anyone know of a way the index a given row in a for loop like that?


Sadly, ML doesn't support zero-based indexing. x(0,:) isn't allowed. What a shame.
From: Oleg Komarov on 18 Jan 2010 05:44
"Steve Amphlett"
> > I have a rather simple matlab script that I am recieving the following error on:
> > Subscript indices must either be real positive integers or logicals.
> >
> > size = 10;
> > x = zeros(size,6);
> > for i = 0:size
> > x(i,:) = [i (i +1) (i +2) (i + 3) (i + 4) (i + 5) ];
> > end
> >
> > I know the reason I aym recieving the error is because I am using i in the index of the x matrix, but it seems like i should be able to do this.... Does anyone know of a way the index a given row in a for loop like that?
>
>
> Sadly, ML doesn't support zero-based indexing. x(0,:) isn't allowed. What a shame.
Steve,
why it's a shame? (I use just Matlab and T-SQL so i can't find any good reason to be asham for :))
Oleg
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