[R] how to ignore NA with "NA" or "NULL"

[jeff6868]

Hello Rui,

Sorry I read your post after having answered to jeff.

If seems effectively to be better than ifelse, thanks. But I still have some
errors:
Error in x[1:8700, 1] : incorrect number of dimensions AND
In is.na(xx) : is.na() applied to non-(list or vector) of type 'NULL

It seems to have modified the length of my data, due to these NAs

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