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From: paul doherty on 12 Jul 2010 10:34
Cheers for your replies,

spot on.

On Jul 12, 2:59 pm, "someone" <some...(a)somewhere.net> wrote:
> "Paul doherty" <doher...(a)gmail.com> wrote in message <i1f65c$ap...(a)fred.mathworks.com>...
> > I'm pretty new to MATLAB coding. I have a matrix with multiple rows (the number varies) and 3 columns. That looks something like the following:
> > 1  2       5
> > 1.3        4       1
> > 1.4        2       2
> > 1.5        3       3
>
> > I'm sure this is really simple, but how do I reduce the matrix down. Specifically the first column contains increasing numbers. Depending on the application, I will want the matrix to contain numbers that will be below a specific number X (eg. 1.4). So I want to reduce the matrix down to:
>
> > 1  2       5
> > 1.3        4       1
>
> > However the number X changes for different applications and the matrix is massive. Any help greatly appreciated?
>
> % One solution:
>
> x = [1 2 5;1.3 4 1;1.4 2 2;1.5 3 3];
> X = 1.35;
> y = x(x(:,1)<X,:)
> y =
>
>     1.0000    2.0000    5.0000
>     1.3000    4.0000    1.0000

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