Re: [R] controlling the number of times a script is repeated in a loop
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
Rfor (i in 1:ncol(your_matrix))?
Carl
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[R] controlling the number of times a script is repeated in a loop
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) Not entirely sure how to go about this though, or if I am even on the right track. Maybe I need to get rid of the master for loop as perhaps for loops are more constraining in the number of times the program is run? The number of runs to get all original columns replaced with new ones will never be the same (I plan on running this several times, with time steps ending when all original columns are replaced. Perhaps at the end of each time step I can set column names to have no column names (so from ys to nothing), allowing me to use this method for each time step)... I know it is always helpful to have some code to work with, but it seems impractical to send the whole program as one part if it I am still working on and would probably just create more confusion. Hopefully someone might be able to offer a few suggestions...I can try to come up with a toy program to send along but I am not good enough in R yet to do this quickly! Thank you for all the help and I am sorry if this question is perhaps a bit confusing! If I have not made my problem and what I hope to do clear, please let me know. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] controlling the number of times a script is repeated in a loop
On Sun, Nov 30, 2008 at 12:21 PM, Salas, Andria Kay [EMAIL PROTECTED] 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
--
http://had.co.nz/
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and provide commented, minimal, self-contained, reproducible code.
