[R] trim NA from concatenate result

[Kai Yang]

Hi Rui,
I use the code to fix my problem:
try$newcol <- gsub(" NA", "", try$newcol)

But, I'll try your solution later.
Thank you for your help.
Kai   On Wednesday, June 2, 2021, 02:08:18 PM PDT, Kai Yang via R-help <r-help using r-project.org> wrote:  
 
 Hi List,
I use paste function to concatenate  3 character columns together.
when I run table to see that, I found 3 categories. How can I write script to trim NA in 2nd and 3rd group and set the first one as NA?
Thanks,
Kai
NA NA NA 
NA NA Adenocarcinoma
NA Other NA

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