[R] assign NA to rows by test on multiple columns of a data frame

[Ek Esawi]

Hi *Massimo,*

*Try this.*

*a <- mydf==0mydf[a] <- NAHTHEK*

On Wed, Nov 22, 2017 at 5:34 AM, Massimo Bressan <
massimo.bressan at arpa.veneto.it> wrote:

>
>
> Given this data frame (a simplified, essential reproducible example)
>
>
>
>
> A<-c(8,7,10,1,5)
>
> A_flag<-c(10,0,1,0,2)
>
> B<-c(5,6,2,1,0)
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> B_flag<-c(12,9,0,5,0)
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>
>
>
> mydf<-data.frame(A, A_flag, B, B_flag)
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>
>
>
> # this is my initial df
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> mydf
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>
>
>
> I want to get to this final situation
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>
>
>
> i<-which(mydf$A_flag==0)
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> mydf$A[i]<-NA
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>
>
>
> ii<-which(mydf$B_flag==0)
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> mydf$B[ii]<-NA
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>
>
>
> # this is my final df
>
> mydf
>
>
>
>
> By considering that I have to perform this task in a data frame with many
> columns I’m wondering if there is a compact and effective way to get the
> final result with just one ‘sweep’ of the dataframe?
>
>
>
>
> I was thinking to the function apply or lapply but I can not properly
> conceive how to…
>
>
>
>
> any hint for that?
>
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