大约有 40,000 项符合查询结果（耗时：0.0419秒） [XML]
For each row return the column name of the largest value
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One option using your data (for future reference, use set.seed() to make examples using 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:
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HashMap and int as key
...er than hashmap, but more memory efficient. So, don't use it on large data sets.
– TpoM6oH
Jun 17 '14 at 11:22
How is ...
Css height in percent not working [duplicate]
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You need to set a 100% height on all your parent elements, in this case your body and html. This fiddle shows it working.
html, body { height: 100%; width: 100%; margin: 0; }
div { height: 100%; width: 100%; background: #F52887; }
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jQuery append() vs appendChild()
...ation on append method
Quoting MDN
The ParentNode.append method inserts a set of Node objects or DOMString objects after the last child of the ParentNode. DOMString objects are inserted as equivalent Text nodes.
This is not supported by IE and Edge but supported by Chrome(54+), Firefox(49+) and Op...
Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
...M in the following way:
First take 2 variables: COUNTER and VALUE.
First set all registers to 0;
Every time you receive an integer I, increment COUNTER and set VALUE to max(VALUE, I);
Then send an ICMP echo request packet with data set to I to the router. Erase I and repeat.
Every time you receive...
Remove all occurrences of a value from a list?
In Python remove() will remove the first occurrence of value in a list.
23 Answers
2...
Given an emacs command name, how would you find key-bindings ? (and vice versa)
...s help's "where-is" feature
C-h w command-name
If multiple bindings are set for the command they will all be listed.
For the inverse, given a key sequence, you can type
C-h k key-sequence
To get the command that would run.
You can get detailed information about a command, also any non-inte...
Print function log /stack trace for entire program using firebug
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
...
Move the most recent commit(s) to a new branch with Git
...is:
git checkout existingbranch
git merge master
git checkout master
git reset --hard HEAD~3 # Go back 3 commits. You *will* lose uncommitted work.
git checkout existingbranch
Moving to a new branch
WARNING: This method works because you are creating a new branch with the first command: git branch ...
How to write a switch statement in Ruby
How do I write a switch statement in Ruby?
24 Answers
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