R help - Jun 2008 - how to select out some columns using cbind()

Hello! I have a matrix:
> dim(data1)
[1] 34176   581

of 34176 rows and 581 columns,

I want to make a new matrix data2 by taking the 2nd column, 9th column, 16th
column....

the column number is in the order of:

2
9 (2+7)
16 (9+7)
23 (16+7)
...

the new matrix data2 should include 83 columns, is there an easy way to
do that using cbind() function?

Thanks a lot!

Allen

	[[alternative HTML version deleted]]

newdata1 <- data1[, seq(from=2, to=ncol(data1), by=7)]

On Sat, Jun 14, 2008 at 7:27 PM, ss <affysnp at gmail.com>
wrote:
> Hello! I have a matrix:
>
>> dim(data1)
> [1] 34176   581
>
> of 34176 rows and 581 columns,
>
> I want to make a new matrix data2 by taking the 2nd column, 9th column,
16th
> column....
>
> the column number is in the order of:
>
> 2
> 9 (2+7)
> 16 (9+7)
> 23 (16+7)
> ...
>
> the new matrix data2 should include 83 columns, is there an easy way to
> do that using cbind() function?
>
> Thanks a lot!
>
> Allen
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
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http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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