I want to get a value that has been assigned to a variable, and then use
that value to be the name of a variable.
For example,
tTargTFS[1,1]
# returns:
V1
"AT1G01010"
Now, I want to make AT1G01010 the name of a variable:
AT1G01010 <- tTargTFS[-1,1]
Then, go to the next tTargTFS[1,2]. Which produces
V1
"AT1G01030"
And then,
AT1G01030 <- tTargTFS[-1,2]
I want to do this up to tTargTFS[1, 2666], so I want to do this in a
script and not manually.
tTargTFS is a list of 2: chr [1:265, 1:2666], but I also have the data
in a data frame of 265 observations of 2666 variables, if this data
structure makes things easier.
My initial attempts are not working. Starting with a test data structure
that is a little simpler I have tried:
for (i in 1:4)
{ ATG <- tTargTFS[1, i]
assign(cat(ATG), tTargTFS[-1, i]) }
Matthew
Hi Matthew,
This question is a bit mysterious as we don't know what the object
"chr" is. However, have a look at this and see if it is close to what
you want to do.
# set up a little matrix of character values
tTargTFS<-matrix(paste("A",rep(1:4,each=4),"B",rep(1:4,4),sep=""),ncol=4)
# try the assignment on the first row and column
assign(tTargTFS[1,1],tTargTFS[-1,1])
# see what it looks like - okay
A1B1
# run the assignment over the matrix
for(i in 1:4) assign(tTargTFS[1,i],tTargTFS[-1,i])
# see what the variables look like
A1B1
A2B1
A3B1
A4B1
It does what I would expect.
Jim
On Tue, Jul 12, 2016 at 6:01 AM, Matthew
<mccormack at molbio.mgh.harvard.edu> wrote:> I want to get a value that has been assigned to a variable, and then use
> that value to be the name of a variable.
>
> For example,
>
> tTargTFS[1,1]
> # returns:
> V1
> "AT1G01010"
>
> Now, I want to make AT1G01010 the name of a variable:
> AT1G01010 <- tTargTFS[-1,1]
>
> Then, go to the next tTargTFS[1,2]. Which produces
> V1
> "AT1G01030"
> And then,
> AT1G01030 <- tTargTFS[-1,2]
>
> I want to do this up to tTargTFS[1, 2666], so I want to do this in a script
> and not manually.
> tTargTFS is a list of 2: chr [1:265, 1:2666], but I also have the data in a
> data frame of 265 observations of 2666 variables, if this data structure
> makes things easier.
>
> My initial attempts are not working. Starting with a test data structure
> that is a little simpler I have tried:
> for (i in 1:4)
> { ATG <- tTargTFS[1, i]
> assign(cat(ATG), tTargTFS[-1, i]) }
>
> Matthew
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
Hi Jim,
Wow ! And it does exactly what I was looking for. Thank you very much.
That assign function is pretty nice. I should become more familiar with it.
Matthew
On 7/11/2016 5:59 PM, Jim Lemon wrote:> Hi Matthew,
> This question is a bit mysterious as we don't know what the object
> "chr" is. However, have a look at this and see if it is close to
what
> you want to do.
>
> # set up a little matrix of character values
>
tTargTFS<-matrix(paste("A",rep(1:4,each=4),"B",rep(1:4,4),sep=""),ncol=4)
> # try the assignment on the first row and column
> assign(tTargTFS[1,1],tTargTFS[-1,1])
> # see what it looks like - okay
> A1B1
> # run the assignment over the matrix
> for(i in 1:4) assign(tTargTFS[1,i],tTargTFS[-1,i])
> # see what the variables look like
> A1B1
> A2B1
> A3B1
> A4B1
>
> It does what I would expect.
>
> Jim
>
>
> On Tue, Jul 12, 2016 at 6:01 AM, Matthew
> <mccormack at molbio.mgh.harvard.edu> wrote:
>> I want to get a value that has been assigned to a variable, and then
use
>> that value to be the name of a variable.
>>
>> For example,
>>
>> tTargTFS[1,1]
>> # returns:
>> V1
>> "AT1G01010"
>>
>> Now, I want to make AT1G01010 the name of a variable:
>> AT1G01010 <- tTargTFS[-1,1]
>>
>> Then, go to the next tTargTFS[1,2]. Which produces
>> V1
>> "AT1G01030"
>> And then,
>> AT1G01030 <- tTargTFS[-1,2]
>>
>> I want to do this up to tTargTFS[1, 2666], so I want to do this in a
script
>> and not manually.
>> tTargTFS is a list of 2: chr [1:265, 1:2666], but I also have the data
in a
>> data frame of 265 observations of 2666 variables, if this data
structure
>> makes things easier.
>>
>> My initial attempts are not working. Starting with a test data
structure
>> that is a little simpler I have tried:
>> for (i in 1:4)
>> { ATG <- tTargTFS[1, i]
>> assign(cat(ATG), tTargTFS[-1, i]) }
>>
>> Matthew
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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.
David Winsemius
2016-Jul-11 22:24 UTC
[R] use value in variable to be name of another variable
> On Jul 11, 2016, at 1:01 PM, Matthew <mccormack at molbio.mgh.harvard.edu> wrote: > > I want to get a value that has been assigned to a variable, and then use that value to be the name of a variable. > > For example, > > tTargTFS[1,1] > # returns: > V1 > "AT1G01010" > > Now, I want to make AT1G01010 the name of a variable: > AT1G01010 <- tTargTFS[-1,1] > > Then, go to the next tTargTFS[1,2]. Which produces > V1 > "AT1G01030" > And then, > AT1G01030 <- tTargTFS[-1,2] > > I want to do this up to tTargTFS[1, 2666], so I want to do this in a script and not manually. > tTargTFS is a list of 2: chr [1:265, 1:2666], but I also have the data in a data frame of 265 observations of 2666 variables, if this data structure makes things easier. > > My initial attempts are not working. Starting with a test data structure that is a little simpler I have tried: > for (i in 1:4) > { ATG <- tTargTFS[1, i] > assign(cat(ATG), tTargTFS[-1, i]) }Your efforts will come to naught (or more prezactly... NULL) when you use `cat` as a value. You are essentially doing the R equivalent of answering the question about the sound of one hand clapping. -- David Winsemius Alameda, CA, USA