filtmut: Exclusively mutate rows to which filter applies

In vanderlindenma/lindenutils: R package with common utility functions for Martin Van der Linden

Description

Mutate rows of df for which string filt applies, with mutation described by string mutation (https://stackoverflow.com/questions/69922602/using-mutate-in-custom-function-with-mutation-condition-as-argument/69923793#69923793)

Usage

filtmut(df, filt, mut)

Arguments

df	A dataframe
filt	A string describing the filter condition
mut	A string describing the mutation to perform on rows to which the filter condition applies

Value

A dataframe where mutate mut has been applied exclusively to rows for which filt applies

Examples

filtmut(mtcars, "cyl == 6", "mpg = 20*mpg")
           mpg cyl  disp  hp drat    wt  qsec vs am gear carb
Mazda RX4           420.0   6 160.0 110 3.90 2.620 16.46  0  1    4    4
Mazda RX4 Wag       420.0   6 160.0 110 3.90 2.875 17.02  0  1    4    4
Hornet 4 Drive      428.0   6 258.0 110 3.08 3.215 19.44  1  0    3    1
Valiant             362.0   6 225.0 105 2.76 3.460 20.22  1  0    3    1
Merc 280            384.0   6 167.6 123 3.92 3.440 18.30  1  0    4    4
Merc 280C           356.0   6 167.6 123 3.92 3.440 18.90  1  0    4    4
Ferrari Dino        394.0   6 145.0 175 3.62 2.770 15.50  0  1    5    6
Datsun 710           22.8   4 108.0  93 3.85 2.320 18.61  1  1    4    1
Hornet Sportabout    18.7   8 360.0 175 3.15 3.440 17.02  0  0    3    2
Duster 360           14.3   8 360.0 245 3.21 3.570 15.84  0  0    3    4
...

vanderlindenma/lindenutils documentation built on Dec. 23, 2021, 2:10 p.m.