Dear Bill, and Bill,
many thanks for taking the time to advice, and for your suggestions. I
believe that I shall rephrase a bit my question, with a better example :
thank you again in advance for your help.
Let's assume that we start from a data frame :
x = data.frame( TTT=c(0,1,0,0),
TTA=c(0,1,1,0),
ATA=c(1,0,0,0),
ATT=c(0,0,0,0),
row.names=c("gene1", "gene2", "gene3", "gene4"))
Shall we select "gene2", at the end, we would like to have ONLY the
COLUMNS, where "gene2" is NOT-ZERO. In other words, the output contains
only the first 2 columns :
output = data.frame( TTT=c(0,1,0,0),
TTA=c(0,1,1,0),
row.names=c("gene1", "gene2", "gene3",
"gene4"))
with much appreciation,
-- bogdan
On Thu, Nov 1, 2018 at 6:34 PM William Michels <w...@caa.columbia.edu>
wrote:
> Hi Bogdan,
>
> Are you saying you want to drop columns that sum to zero? If so, I'm
> not sure you've given us a good example dataframe, since all your
> numeric columns give non-zero sums.
>
> Otherwise, what you're asking for is trivial. Below is an example
> dataframe ("ygene") with an example "AGA" column that gets dropped:
>
> > xgene <- data.frame(TTT=c(0,1,0,0),
> + TTA=c(0,1,1,0),
> + ATA=c(1,0,0,0),
> + gene=c("gene1", "gene2", "gene3", "gene4"))
> >
> > xgene[ , colSums(xgene[,1:3]) > 0 ]
> TTT TTA ATA gene
> 1 0 0 1 gene1
> 2 1 1 0 gene2
> 3 0 1 0 gene3
> 4 0 0 0 gene4
> >
> > ygene <- data.frame(TTT=c(0,1,0,0),
> + TTA=c(0,1,1,0),
> + AGA=c(0,0,0,0),
> + gene=c("gene1", "gene2", "gene3", "gene4"))
> >
> > ygene[ , colSums(ygene[,1:3]) > 0 ]
> TTT TTA gene
> 1 0 0 gene1
> 2 1 1 gene2
> 3 0 1 gene3
> 4 0 0 gene4
>
>
> HTH,
>
> Bill.
>
> William Michels, Ph.D.
>
>
> On Thu, Nov 1, 2018 at 5:45 PM, Bogdan Tanasa <tan...@gmail.com> wrote:
> > Dear all, please may I ask for a suggestion :
> >
> > considering a dataframe that contains the numerical values for gene
> > expression, for example :
> >
> > x = data.frame(TTT=c(0,1,0,0),
> > TTA=c(0,1,1,0),
> > ATA=c(1,0,0,0),
> > gene=c("gene1", "gene2", "gene3", "gene4"))
> >
> > how could I select only the COLUMNS where the value of a GENE (a ROW) is
> > non-zero ?
> >
> > thank you !
> >
> > -- bogdan
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
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