[R] Help on nested FOR loops

[Julian Burgos]

Hey Philip,

I'm not sure if I understand what your "x11", "x12", etc. are.  You can 
combine the values of your two vectors using the expand.grid function. 
There is no need to do nester FOR loops:

 > i=c(1,2,3,4,5)
 > j=c(1,2,3)
 > x=expand.grid(i,j)
 > print (x)

    Var1 Var2
1     1    1
2     2    1
3     3    1
4     4    1
5     5    1
6     1    2
7     2    2
8     3    2
9     4    2
10    5    2
11    1    3
12    2    3
13    3    3
14    4    3
15    5    3

Hope this helps,

Julian

Philip Twumasi-Ankrah wrote:
> I am new to more radical programming in R. I am trying to write a nested 'for' loop to produce output that takes subscripts like:
> 
> for i taking values 1,2,3,4,5 and 
>     j taking values 1,2,3
> 
> I want to output for a computation using the combination values of i and j a value x like this;
> 
> i   j    x
> 1  1   x11
> 1  2   x12
> 1  3   x13
> 2  1   x21
>  2  2   x22
>  2  3   x23
> 3  1   x31
>  3  2   x32
>  3  3   x33
> ........
> .......
> 
> Need help urgently.
> 
> Thanks.
> 
> Philip
> 
> 
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