[R] adding a named column to a Matrix

[David Winsemius]

On Oct 13, 2010, at 4:44 PM, Alison Callahan wrote:

> Hello all,
>
> I am trying to use cbind to add a named empty column to a Matrix:
>
> outputmatrix <- cbind(outputmatrix,kog_id = seq(0,0,0))

Not sure off the top of my head what the right way might be, but this  
should work:

names(outputmatrix)[ which( names(outputmatrix) == "kog_id")] <- kog_id

>
> The problem I have is that kog_id is a variable that has a value e.g.
> "KOG1234", but I when I try to use this to name the added column, it
> is named literally "kog_id" instead of "KOG1234".
>
> How can I name a column by passing in a variable for the column name?
> I am performing this action inside of a for loop, so I can't
> necessarily know the position of the column in order to name it after
> it is created.
>
> Thanks,
>
> Alison Callahan


David Winsemius, MD
West Hartford, CT