大约有 38,000 项符合查询结果（耗时：0.0268秒） [XML]
For each row return the column name of the largest value
... sample reproducible):
DF <- data.frame(V1=c(2,8,1),V2=c(7,3,5),V3=c(9,6,4))
colnames(DF)[apply(DF,1,which.max)]
[1] "V3" "V1" "V2"
A faster solution than using apply might be max.col:
colnames(DF)[max.col(DF,ties.method="first")]
#[1] "V3" "V1" "V2"
...where ties.method can be any of "ran...
Fastest way to remove first char in a String
...
answered Jul 11 '10 at 6:44
Jon SkeetJon Skeet
1210k772772 gold badges85588558 silver badges88218821 bronze badges
...
Applying a function to every row of a table using dplyr?
...
|
edited Aug 6 '19 at 3:20
answered Jul 14 '14 at 0:20
...
How do you use an identity file with rsync?
...
6 Answers
6
Active
...
How to do a less than or equal to filter in Django queryset?
...
|
edited May 26 at 19:02
phoenix
3,20611 gold badge2727 silver badges3131 bronze badges
answ...
Difference between passing array and array pointer into function in C
...
First, some standardese:
6.7.5.3 Function declarators (including prototypes)
...
7 A declaration of a parameter as ‘‘array of type’’ shall be adjusted to ‘‘qualified pointer to
type’’, where the type qualifiers (if any) are those spec...
LINQ Distinct operator, ignore case?
...
answered Nov 12 '08 at 6:41
Marc Gravell♦Marc Gravell
888k227227 gold badges23562356 silver badges27202720 bronze badges
...
What is meant by Ems? (Android TextView)
...
6 Answers
6
Active
...