Not tested, but for data.frame 'df', try
df$coal <- ifelse(!is.na(df$Name.x), df$Name.x, df$Name.y)
But see the help page for 'ifelse' regarding issues with classes, and
the myriad R-help posts on the 'ifelse' function.
Erik
Ivan Alves wrote:
Dear all,
I searched the mail archives and the R site and found no guidance (tried
"merge", "cbind" and terms like "coalesce" with no success). There
surely is a way to coalesce (like in SQL) columns in a dataframe,
right? For example, I would like to go from a dataframe with two
columns to one with only one as follows:
From
Name.x Name.y
nx1 ny1
nx2 NA
NA ny3
NA NA
...
To
Name
nx1
nx2
ny3
NA
...
where column Name.x is taken if there is a value, and if not then column
Name.y
Any help would be appreciated
Kind regards,
Ivan
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