如何从R数据框中的字符串中提取数字?
要从 R 数据框中的字符串中提取数字,我们可以按照以下步骤操作 -
首先,创建一个数据框。
然后,使用 gsub 函数从字符串中提取数字。
示例
创建数据框
让我们创建一个数据框,如下所示 -
x<-输出结果sample(c("grp12","grp01","grp05","grp03","grp04","grp09","grp10","grp11","grp02","grp06","grp07","grp08"),25,replace=TRUE)
df<-data.frame(x)
df
执行时,上述脚本生成以下内容output(this output will vary on your system due to randomization)-
x1 grp01
2 grp04
3 grp08
4 grp01
5 grp12
6 grp08
7 grp08
8 grp09
9 grp02
10 grp12
11 grp05
12 grp10
13 grp04
14 grp06
15 grp03
16 grp08
17 grp06
18 grp05
19 grp10
20 grp10
21 grp06
22 grp04
23 grp04
24 grp06
25 grp06
从字符串中提取数字
使用 gsub 函数从数据框 df 中的字符串列 x 中提取数字 -
x<-输出结果sample(c("grp12","grp01","grp05","grp03","grp04","grp09","grp10","grp11","grp02","grp06","grp07","grp08"),25,replace=TRUE)
df<-data.frame(x)
df$Group<-gsub("[^0-9]","",df$x)
df
x Group1 grp01 01
2 grp04 04
3 grp08 08
4 grp01 01
5 grp12 12
6 grp08 08
7 grp08 08
8 grp09 09
9 grp02 02
10 grp12 12
11 grp05 05
12 grp10 10
13 grp04 04
14 grp06 06
15 grp03 03
16 grp08 08
17 grp06 06
18 grp05 05
19 grp10 10
20 grp10 10
21 grp06 06
22 grp04 04
23 grp04 04
24 grp06 06
25 grp06 06
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