R select column names starting with

#  Data
df <- data.frame( ABC_1 = runif(3),
            ABC_2 = runif(3),
            XYZ_1 = runif(3),
            XYZ_2 = runif(3) )

#      ABC_1     ABC_2     XYZ_1     XYZ_2
#1 0.3792645 0.3614199 0.9793573 0.7139381
#2 0.1313246 0.9746691 0.7276705 0.0126057
#3 0.7282680 0.6518444 0.9531389 0.9673290

#  Use grepl
df[ , grepl( "ABC" , names( df ) ) ]
#      ABC_1     ABC_2
#1 0.3792645 0.3614199
#2 0.1313246 0.9746691
#3 0.7282680 0.6518444

#  grepl returns logical vector like this which is what we use to subset columns
grepl( "ABC" , names( df ) )
#[1]  TRUE  TRUE FALSE FALSE

Source: stackoverflow.com

Similar codes

0 vote392 views1 answer
Select last child with class in r
R
1 vote386 views2 answers
Convert dataframe row to vector r
R
0 vote391 views1 answer
R check object dimensions
R
0 vote424 views1 answer
Set row names in r
R
0 vote369 views1 answer
How to add columns to a flextable in r
R
0 vote386 views2 answers
Modulo in r
R
2 votes380 views1 answer
Setwd in r
R
0 vote432 views1 answer
Reorder columns in r
R
0 vote382 views1 answer
List to vector r
R
1 vote392 views1 answer
R convert string to list of characters
R