R: if condition on empty data frame returns error in if (d2 == 0L) { : missing value where TRUE/FALSE needed

Asked Oct 23 '16 at 02:58

Active Oct 23 '16 at 02:58

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I am trying to extract values from a nested list of data frames. One data frame has a column which is data frame and sometimes it is empty. Therefore I used the if condition, as suggested in this post:
Why does an empty dataframe fail an is.null() test? if (is.data.frame(df) && nrow(df)==0)

However, I get error as:

Error in if (d2 == 0L) { : missing value where TRUE/FALSE needed

Can someone teach me how to make an if condition to return TRUE/FALSE on whether a data frame is empty or not?

Thanks.

edited May 23 '17 at 12:06

Community

asked Oct 23 '16 at 02:58

Rui

if(class(df)=="data.frame" & nrow(df)==0) – Amit Kohli Oct 23 '16 at 03:33
1

Post `dput` from an "empty dataframe". At the moment it's not clear what sort of structure you are building. – IRTFM Oct 23 '16 at 04:34
there is a function in R called is.na.data.frame() – Dinesh.hmn Oct 23 '16 at 07:50

R: if condition on empty data frame returns error in if (d2 == 0L) { : missing value where TRUE/FALSE needed

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