[R] Question on Variabeles

Uwe Ligges ligges at statistik.tu-dortmund.de
Sun Mar 8 19:20:08 CET 2009

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,

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