[R] can not extract rows which match a string

William Michels wjm1 @end|ng |rom c@@@co|umb|@@edu
Thu Oct 3 21:45:59 CEST 2019


I expected the code you posted to work just as you presumed it would,
but without a reproducible example--I can only speculate as to why it

In the t1 dataframe, if indeed you only want to remove rows of the
t1$sex_chromosome_aneuploidy_f22019_0_0 column which are undefined,
you could try the following:

> t11 <- t1[ !is.na(t1$sex_chromosome_aneuploidy_f22019_0_0), ]

HTH, Bill.

W. Michels, Ph.D.

On Thu, Oct 3, 2019 at 11:59 AM Ana Marija <sokovic.anamarija using gmail.com> wrote:
> Hello,
> I have a dataframe (t1) with many columns, but the one I care about it this:
> > unique(t1$sex_chromosome_aneuploidy_f22019_0_0)
> [1] NA    "Yes"
> it has these two values.
> I would like to remove from my dataframe t1 all rows which have "Yes"
> in t1$sex_chromosome_aneuploidy_f22019_0_0
> I tried selecting those rows with "Yes" via:
> t11=t1[t1$sex_chromosome_aneuploidy_f22019_0_0=="Yes",]
> but I got t11 which has the exact same number of rows as t1.
> If I do:
> > table(t1$sex_chromosome_aneuploidy_f22019_0_0)
> Yes
> 620
> So there is for sure 620 rows which have "Yes". How to remove those
> from my t1 data frame?
> Thanks
> Ana
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