Really?
str( df[ , grep(".*_a*.", names(df)) ] )
On September 15, 2021 7:53:17 AM PDT, Luigi Marongiu <marongiu.luigi at gmail.com> wrote:
Hello,
I have a dataframe and I would like to browse the information of its
structure only for a subset of columns (since there are hundreds of
them).
For instance, I tried with grepping some columns as in:
```
df <- data.frame(var_a1 = c(letters[1:3], letters[1:4]),
var2 = c(LETTERS[1:7]),
var_a2 = c(letters[1:3], letters[1:4]),
var4 = (1:7)^2,
var_a3 = c("light", "light", "heavy", "heavy", "heavy",
"light", "heavy"),
stringsAsFactors = FALSE)
grep("*._a*.", names(df))
[1] 1 3 5
```
This tells me that the pattern v_1 is present in the name of columns 1 3 5.
Would it be possible to get a str() of just these columns?
```
'data.frame': 7 obs. of 5 variables:
$ var_a1: chr "a" "b" "c" "a" ...
$ var2 : chr "A" "B" "C" "D" ...
$ var_a2: chr "a" "b" "c" "a" ...
$ var4 : num 1 4 9 16 25 36 49
$ var_a3: chr "light" "light" "heavy" "heavy" ...
```
Thank you
--
Sent from my phone. Please excuse my brevity.