Robin Hankin wrote:
> The error is given because after B[[1]] <- a, the variable B is
> just a scalar and
> not a matrix (why is this?)
>
Because [[i]] indexes more general vectors, and if you do B[[1]] when
B is NULL, R doesnt know if you want B to be a list or a simple vector.
If you initialise B as an empty list then R knows:
> B=list()
> B
list()
> B[[1]]=b
> B
[[1]]
[,1]
[1,] 1
Barry
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