R lapply convert to integer but keep rownames

Question

I am trying all afternoon to do this:

Convert a dataframe to integer, which works fine: cts <- lapply(cts, function(x) as.integer(x))

But afterwards my rownames(cts) = Null. I want to keep my rownames. How do I exclude them from this conversion?

Thanks so much!!

Show us some reproducible data – Chris Ruehlemann Jul 20 '20 at 14:52 — Chris Ruehlemann, Jul 20 '20 at 14:52

Ronak Shah · Accepted Answer · 2020-07-20T14:55:23.143

3

Use [] to preserve the attributes i.e rownames here.

cts[] <- lapply(cts, as.integer)

Using mtcars as reproducible example.

df <- mtcars
rownames(df)
df <- lapply(df, as.numeric)
rownames(df)
df <- mtcars
df[] <- lapply(df, as.numeric)
rownames(df)

edited Jul 20 '20 at 14:55

answered Jul 20 '20 at 14:53

Ronak Shah

ohh wow thanks so much!! so whenever i want to save the "settings" from before i do this "[]" ? – Bine Jul 20 '20 at 14:54
Yes, it should save it most of the times. – Ronak Shah Jul 20 '20 at 14:57
You can also use `lapply(cts, as.integer)` as R recognizes `as.integer` as a function – Chris Ruehlemann Jul 20 '20 at 14:58
Very helpful, i didnt know :) – Bine Jul 20 '20 at 14:58
You would use the `function(x)` format if you define a custom-made function – Chris Ruehlemann Jul 20 '20 at 14:59

1 Answers1