Frankly, this is great. I don’t really care if it base or tidy, I just need it
to work.
Thank you kindly!
Shawn Way, PE
From: Eric Berger <ericjber...@gmail.com>
Sent: Tuesday, August 06, 2019 8:30 AM
To: Shawn Way <s...@meco.com>
Cc: r-help@r-project.org
Subject: Re: [R] Using Partial Column Matching for Mutate
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Hi Shawn,
Here is a solution using base R (no dplyr). The only regex appears in the
statement to get the common prefixes.
colsPrefixes <- sub("_Planned$","",colnames(gross_test)[
grep("_Planned$",colnames(gross_test))])
f <- function(s) {
gross_test[,paste(s,"Diff",sep="_")] <<-
gross_test[,paste(s,"Actual",sep="_")] - gross_test[,paste(s,"Planned",sep="_")]
}
tmpOut <- sapply(colsPrefixes,f)
HTH,
Eric
On Tue, Aug 6, 2019 at 3:34 PM Shawn Way <s...@meco.com<mailto:s...@meco.com>>
wrote:
I have a tibble that has a large number of variables and because I'm partial
lazy (and I really want to know how to do this), I would like find out if it
possible to partial column matching with the mutate function in the tidyverse.
I have a tibble with the following
> gross_test <- gross_df %>%
+
select(Job,Mfg_Labor_Hrs_Planned,Mfg_Labor_Hrs_Actual,Eng_Labor_Hrs_Planned,Eng_Labor_Hrs_Actual)
> gross_test
# A tibble: 6 x 5
Job Mfg_Labor_Hrs_Pla~ Mfg_Labor_Hrs_Ac~ Eng_Labor_Hrs_Pl~ Eng_Labor_Hrs_Ac~
* <dbl> <dbl> <dbl> <dbl> <dbl>
1 9892 950. 1082. 133 302.
2 9893 950. 1082. 133 302.
3 9652 950. 1082. 133 302.
4 9894 950. 1082. 133 302.
5 9652 950. 1082. 133 302.
6 9894 950. 1082. 133 302.
>
The column names follow a pattern of (.+)_Planned and (.+)_Actual and there are
a large number of them. What I would like to do is the following:
mutate(Mfg_Labor_Hrs_Diff= Mfg_Labor_Hrs_Actual- Mfg_Labor_Hrs_Planned)
using a regex. Something like the following
mutate( $1_Diff = $1_Actual - $1_Planned)
Where $1 was Mfg_Labor_Hrs. This would iterate over the entire set of columns
doing Mfg_Labor_Hrs and then Eng_Labor_Hrs, etc.
Is this even possible or will I need to explicitly write out the mutate for
each combination?
Thanks for looking at this.
Shawn Way, P.E.
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