[R] How to create a new column based on the values from multiple columns which are matching a particular string?

[Eric Berger]

You may have a typo/misstatement in your question.
You define a data frame with 5 columns, each of which has 10 elements, so
your data frame has dimensions 10 x 5.
Then you request a new COLUMN which will have only 5 elements, which is not
allowed. All columns of a data frame
must have the same length.

On Mon, Jul 29, 2019 at 8:42 PM Ana Marija <sokovic.anamarija using gmail.com>
wrote:

> I have data frame which looks like this:
>
> df=data.frame(
>   eye_problemsdisorders_f6148_0_1=c(A,C,D,NA,D,A,C,NA,B,A),
>   eye_problemsdisorders_f6148_0_2=c(B,C,NA,A,C,B,NA,NA,A,D),
>   eye_problemsdisorders_f6148_0_3=c(C,A,D,D,B,A,NA,NA,A,B),
>   eye_problemsdisorders_f6148_0_4=c(D,D,NA,B,A,C,NA,C,A,B),
>   eye_problemsdisorders_f6148_0_5=c(C,C,NA,D,B,C,NA,D,D,B))
>
> In reality I have much more columns and they don't always match
> "eye_problemsdisorders_f6148" this string, and there is much more rows.
>
> What I would like to do is create a new column, say named "case" where I
> would have value "1" for every row where string "A" appears at least once
> in any column, if not the value would be "0". So in the above example
> column "case" would have these values: 1,1,1,1,0
> Thanks
> Ana
>
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>
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