Hi,
I'm having trouble applying the matrix function. I'd like to be able to
create a matrix of vectors filled in by rows, which are not all the same
length, and so I need it to fill in NAs where applicable.
It's easiest to explain with a simple example:
Suppose vec = c(3,4,5). How can I form a matrix of the vectors 1:vec[j]
for j=1:3?
i.e. 1 2 3 NA NA
1 2 3 4 NA
1 2 3 4 5
I've tried matrix(c(1:vec[j]),nrow=max(j),ncol=max(vec)) but it will
only give me a matrix with repeated values for j=1, like 1 2 3 1
2
3 1 2 3 1
2 3 1 2 3
Also using the list function hasn't got me anywhere either..
Any help/ideas would be greatly appreciated!
Many thanks,
Sara-Jane Dunn
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