How to Change a Specific Value in a DataFrame in Julia
Overview
To make replacements, use the replace!()
method1. The first argument should be the column of the dataframe you want to change, and the second argument takes a pair A => B
. It’s important that it’s the dataframe’s column being specified here.
Code
julia> WJSN
10×4 DataFrame
Row │ member birth height unit
│ String Int64 Int64 String
─────┼───────────────────────────────
1 │ 다영 99 161 쪼꼬미
2 │ 다원 97 167 메보즈
3 │ 루다 97 157 쪼꼬미
4 │ 소정 95 166 보스즈
5 │ 수빈 96 159 쪼꼬미
6 │ 연정 99 165 메보즈
7 │ 주연 98 172 보스즈
8 │ 지연 95 163 보스즈
9 │ 진숙 99 162 쪼꼬미
10 │ 현정 94 165 보스즈
The example uses the WJSN
dataframe as shown above.
julia> replace!(WJSN.member, "진숙" => "여름"); WJSN
10×4 DataFrame
Row │ member birth height unit
│ String Int64 Int64 String
─────┼───────────────────────────────
1 │ 다영 99 161 쪼꼬미
2 │ 다원 97 167 메보즈
3 │ 루다 97 157 쪼꼬미
4 │ 소정 95 166 보스즈
5 │ 수빈 96 159 쪼꼬미
6 │ 연정 99 165 메보즈
7 │ 주연 98 172 보스즈
8 │ 지연 95 163 보스즈
9 │ 여름 99 162 쪼꼬미
10 │ 현정 94 165 보스즈
The "Jinsuk"
in the :member
column was changed to "Yeoreum"
. Note that replace!()
was used here, not replace()
, and that it was a specific column of the dataframe that was specified.
julia> replace!(WJSN.unit, "보스즈" => "더블랙"); WJSN
10×4 DataFrame
Row │ member birth height unit
│ String Int64 Int64 String
─────┼───────────────────────────────
1 │ 다영 99 161 쪼꼬미
2 │ 다원 97 167 메보즈
3 │ 루다 97 157 쪼꼬미
4 │ 소정 95 166 더블랙
5 │ 수빈 96 159 쪼꼬미
6 │ 연정 99 165 메보즈
7 │ 주연 98 172 더블랙
8 │ 지연 95 163 더블랙
9 │ 여름 99 162 쪼꼬미
10 │ 현정 94 165 더블랙
The "Bozuz"
in the :unit
column was uniformly changed to "The Black"
.
Complete Code
using DataFrames
WJSN = DataFrame(
member = ["다영","다원","루다","소정","수빈","연정","주연","지연","진숙","현정"],
birth = [99,97,97,95,96,99,98,95,99,94],
height = [161,167,157,166,159,165,172,163,162,165],
unit = ["쪼꼬미","메보즈","쪼꼬미","보스즈","쪼꼬미","메보즈","보스즈","보스즈","쪼꼬미","보스즈"]
)
WJSN
replace!(WJSN.member, "진숙" => "여름"); WJSN
replace!(WJSN.unit, "보스즈" => "더블랙"); WJSN
See Also
Environment
- OS: Windows
- julia: v1.6.3