Hi
you definitely shall try to get acustommed with data structures in R. You
do ***not*** have numeric decimal values but factors (probably created by
transfering data to R as you have in the column a value psi1). Then the
assignement places a factor code into matrix instead of a factor value.
fac<-factor(rnorm(100))
daf<-as.data.frame(matrix(fac,10,10))
> sapply(daf, "is.factor")
V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE TRUE
mat[1,10]<-daf[1,10]
> mat
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] NA NA NA NA NA NA NA NA NA 1
[2,] NA NA NA NA NA NA NA NA NA NA
[3,] NA NA NA NA NA NA NA NA NA NA
<snip>
> mat[2,10]<-daf[2,10]
mat[2,10]
[1] 4
daf.n<-sapply(daf, function(x) as.numeric(as.character(x)))
mat[3,10]<-daf.n[3,10]
mat
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
[1,] NA NA NA NA NA NA NA NA NA 1.0000000
[2,] NA NA NA NA NA NA NA NA NA 4.0000000
[3,] NA NA NA NA NA NA NA NA NA 0.2200095
[4,] NA NA NA NA NA NA NA NA NA NA
[5,] NA NA NA NA NA NA NA NA NA NA
You need to get rid of irrelevant values in your data frame first.
Regards
Petr
[EMAIL PROTECTED]
[EMAIL PROTECTED] napsal dne 12.09.2007 16:03:36:
> Hi,
> I have some decimal values stored in a data frame (myframe) and I
> need to place them in a matrix (mymatrix) using a for loop.
> When I type:
>
> > myframe[i,10]
>
> I get:
>
> [1] 0.8714
> 434 Levels: 0 0.0134 0.1062 0.1182 0.1241 0.1322 0.1374 0.1429
> 0.1507 ... psi1
>
> But when I assign that value to the matrix with:
>
> > mymatrix[i,2]<-myframe[i,10]
>
> The value that gets placed in the matrix is 286, and not 0.8714 as I
> wanted it to be. What is wrong?
> The data frame does have several rows of character cells interspersed
> with "NA" and decimal values. It is not very simple I am just using
> it to store a large output worksheet from where I want to draw
> selected values.
>
> Thanks for any help.
>
> G.
>
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