combine filter() and select()
Dear Chris, I didn't think about having the assignment at the end as you showed; it indeed fits the pipe workflow better. By "easy", I actually meant shorter. As you said, in base R, I usually do that in 1 line, so I was hoping to do the same in tidyverse. But I'm glad to hear that I'm using tidyverse the proper way :) Best regards, 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 19/08/2020 19:21, Chris Evans wrote:
Inline ----- Original Message -----
From: "Ivan Calandra" <calandra at rgzm.de>
To: "R-help" <r-help at r-project.org>
Sent: Wednesday, 19 August, 2020 16:56:32
Subject: [R] combine filter() and select()
Dear useRs,
I'm new to the tidyverse world and I need some help on basic things.
I have the following tibble:
mytbl <- structure(list(files = c("a", "b", "c", "d", "e", "f"), prop =
1:6), row.names = c(NA, -6L), class = c("tbl_df", "tbl", "data.frame"))
I want to subset the rows with "a" in the column "files", and keep only
that column.
So I did:
myfile <- mytbl %>%
? filter(grepl("a", files)) %>%
? select(files)
It works, but I believe there must be an easier way to combine filter()
and select(), right?
I would write
mytbl %>%
filter(grepl("a", files)) %>%
select(files) -> myfile
as I like to keep a sort of "top to bottom and left to right" flow when writing in the tidyverse dialect of R but that's really not important.
Apart from that I think what you've done is "proper tidyverse". To me another difference between the dialects is that classical R often seems to put value on, and make it easy, to do things with incredible few characters. I think the people who are brilliant at that sort of coding, and there are many on this list, that sort of coding is also easy to read. I know that Chinese is easy to read if you grew up on it but to a bear of little brain like me, the much more verbose style of tidyverse repays typing time with readability when I come back to my code and, though I have little experience of this yet, when I read other poeple's code.
What did you think wasn't "easy" about what you wrote?
Very best (all),
Chris
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
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