select() columns using their positions

Dear useRs,

I'm still trying to learn tidyverse syntax.

I would like to select() columns based on their positions/indices, but
I
cannot find a way to do that (I've seen a lot about doing that for
rows,
but I could not find anything for columns). I thought it would be
obvious, but I cannot find it.

Basically, I am looking for something like:
mydata %>%
? select( vector_of_indices )
I know that the pipe is useless here, but there are more steps in my
real code.

The helper num_range() works only when headers contains the positions
(e.g. "x1, x2...").

Of course, it's easy using "[", but I expected it would be possible
with
select() as well; it would make the code more readable than:
mydata %>%
? .[ vector_of_indices ]

Thank you for your help.
Ivan

Did you try it?

mydata %>%
? select( c( 1, 2, 4 ) )

On August 20, 2020 1:41:13 AM PDT, Ivan Calandra <calandra at rgzm.de> wrote:

Dear useRs,

I'm still trying to learn tidyverse syntax.

I would like to select() columns based on their positions/indices, but
I
cannot find a way to do that (I've seen a lot about doing that for
rows,
but I could not find anything for columns). I thought it would be
obvious, but I cannot find it.

Basically, I am looking for something like:
mydata %>%
? select( vector_of_indices )
I know that the pipe is useless here, but there are more steps in my
real code.

The helper num_range() works only when headers contains the positions
(e.g. "x1, x2...").

Of course, it's easy using "[", but I expected it would be possible
with
select() as well; it would make the code more readable than:
mydata %>%
? .[ vector_of_indices ]

Thank you for your help.
Ivan

OK, my bad... I'm sure I had tried it and it didn't work, but I guess
the error was somewhere else...

Thank you!
Ivan

--
Dr. Ivan Calandra
TraCEr, laboratory for Traceology and Controlled Experiments
MONREPOS Archaeological Research Centre and
Museum for Human Behavioural Evolution
Schloss Monrepos
56567 Neuwied, Germany
+49 (0) 2631 9772-243
https://www.researchgate.net/profile/Ivan_Calandra

On 20/08/2020 11:03, Jeff Newmiller wrote:

Did you try it?

mydata %>%
 ? select( c( 1, 2, 4 ) )

On August 20, 2020 1:41:13 AM PDT, Ivan Calandra <calandra at rgzm.de> wrote:

Dear useRs,

I'm still trying to learn tidyverse syntax.

I would like to select() columns based on their positions/indices, but
I
cannot find a way to do that (I've seen a lot about doing that for
rows,
but I could not find anything for columns). I thought it would be
obvious, but I cannot find it.

Basically, I am looking for something like:
mydata %>%
 ? select( vector_of_indices )
I know that the pipe is useless here, but there are more steps in my
real code.

The helper num_range() works only when headers contains the positions
(e.g. "x1, x2...").

Of course, it's easy using "[", but I expected it would be possible
with
select() as well; it would make the code more readable than:
mydata %>%
 ? .[ vector_of_indices ]

Thank you for your help.
Ivan