[R] adding columns to a table after a loop

Albert Picado albert_picado at yahoo.fr
Sat Aug 12 16:09:08 CEST 2006


Dear list,

I am trying to find the way to add columns to a table
(or a matrix) after a loop. The result of this loop is
an array and I would like to get all the results in a
single table once the loop is finish. I have
reproduced a simplified example below:

> a<- 1
> b <- matrix()
> while (a <= 4) {
+ b<-rnorm(10)
+ a<- a +1
+ }

# I have tried several methods but without succes so
far. 

> result <- as.data.frame(cbind(b))
> result
             b
1  -0.03250661
2  -0.59823770
3   1.58120471
4   0.41086546
5   0.78959090
6   1.23587125
7   0.83427190
8   1.09035581
9   0.11331056
10  0.25267231

the result above is not what I am looking for because
it shows only the results from the last operation in
the loop, I would like to obtain something like the
following.

> result
            b1         b2          b3         b4
1  -0.08420826 -0.0637943 -0.83246201 -1.0902384
2   0.40623009 -2.7940096  1.37664973  1.6023967
3  -1.13850505  1.1660669 -0.95962296 -0.7325098
4  -1.06183391  1.1063677  1.67948677 -1.9875475
5  -0.64431067 -0.4843952 -1.30742858  0.5064134
6   0.56729468  1.0860484  0.07651954  0.4380108
7   0.95036177 -0.5328609  1.28954934 -0.2775614
8  -0.17848223  0.5340379 -0.22613700  1.0179886
9   2.93145454 -1.8639607 -0.25478610  1.6619754
10  1.51942415 -0.2051423  0.09144450 -1.6329481

I hope someone can give me a hand

best regards

a




	
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