quote:
On Sun, Nov 30, 2008 at 12:21 PM, Salas, Andria Kay
<aks2515_at_uncw.edu> wrote:
> I am running a large for loop and at the end of each iteration a
matrix is produced. The program changes the columns in the matrix, and
each time a column is added the name of that column is "y". All original
columns have no column name. Due to the nature of the program, all
original columns will eventually be replaced with new columns each with
the column name "y". It is at this point that I want the program to stop
running the for loop (right now I just have it running for 20 iterations
resulting in a matrix with a mix of old and new columns). I was thinking
maybe I could do something with an if else statement and the command
colnames. For example:
>
> If(colnames all are "y") (stop) else (run the program again)
Have a look at ?"while" :
while(!(colnames all are "y")) { run the program again }
Hadley
endquote
I may be misunderstanding you, but if you know the number of columns in
the matrix, and on every iteration, one of them is changed, why not just
set the loop up as
R>for (i in 1:ncol(your_matrix)) ?
Carl
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