Hello everyone!
Is anybody can help me to solve this silly question that unfortunately I haven't found the right way to address it.
Supose I have a matrix X[n,n] dimension
I would like to calculate the product of the vectors
Y=X[1,n]*X[n,1]
Then I would like to run the following operation
H=if(Y>0) {H[,1]=1}
The problem is that the condition "if" works only for the first element of the matrix.
Does anybody knows how to apply the conditional "if" to a entire vector?
cheers
Guillermo
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question
3 messages · Armelini, Guillermo, John Kane, Greg Snow
I think this is what you want. Y[Y>0] <- 1 --- "Armelini, Guillermo" <DOCGArmelini at iese.edu> wrote:
Hello everyone!
Is anybody can help me to solve this silly question
that unfortunately I haven't found the right way to
address it.
Supose I have a matrix X[n,n] dimension
I would like to calculate the product of the vectors
Y=X[1,n]*X[n,1]
Then I would like to run the following operation
H=if(Y>0) {H[,1]=1}
The problem is that the condition "if" works only
for the first element of the matrix.
Does anybody knows how to apply the conditional "if"
to a entire vector?
cheers
Guillermo
This message has been scanned for viruses by
TRENDMICRO,
an IESE technology affiliate company and global
leader in antivirus and content security software.
______________________________________________ R-help at 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.
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1 day later
?ifelse
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
(801) 408-8111
> -----Original Message-----
> From: r-help-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] On Behalf Of Armelini, Guillermo
> Sent: Wednesday, December 19, 2007 10:21 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] question
>
> Hello everyone!
>
> Is anybody can help me to solve this silly question that
> unfortunately I haven't found the right way to address it.
>
> Supose I have a matrix X[n,n] dimension
>
> I would like to calculate the product of the vectors
>
> Y=X[1,n]*X[n,1]
>
> Then I would like to run the following operation
>
> H=if(Y>0) {H[,1]=1}
>
> The problem is that the condition "if" works only for the
> first element of the matrix.
>
> Does anybody knows how to apply the conditional "if" to a
> entire vector?
>
> cheers
>
> Guillermo
>
>
>
> This message has been scanned for viruses by TRENDMICRO, an
> IESE technology affiliate company and global leader in
> antivirus and content security software.
>
> ______________________________________________
> R-help at 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.
>