Message-ID: <49B40C58.4040702@statistik.tu-dortmund.de>
Date: 2009-03-08T18:20:08Z
From: Uwe Ligges
Subject: Question on Variabeles
In-Reply-To: <22388117.post@talk.nabble.com>
David1234 wrote:
> Hi everyone,
>
> Im quite new to R an I have the following Question:
>
>
> I would like to define Variables which I can add and multiply etc. and that
> R can simplyfy the terms.
>
> The variables should stand for integers.
> For example I would like to have an entry in an array with variable z
> and if I add b+z the field should now contain 2z+b. Or if the field
> contains 1 and I add z the field should contain 1+z.
>
> How can I solve this problem?
>
> I tried to set z=integer and then for example matrix[1,1]=i
> But this does only work if I assign a value for z first.
>
> I am very grateful for any help.
>
>
> Thank you very much!
>
> David
R is not an algebra system but a system for numerical computations. You
can write a function that represents (i.e. generates and returns) your
matrix and uses its arguments to fill different elements of that matrix.
Best wishes,
Uwe