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What does the comma operator , do?
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answered Sep 9 '08 at 18:37
lillqlillq
12.5k2020 gold badges5050 silver badges5858 bronze badges
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Omit rows containing specific column of NA
... put it into a function thusly:
DF <- data.frame(x = c(1, 2, 3), y = c(0, 10, NA), z=c(NA, 33, 22))
completeFun <- function(data, desiredCols) {
completeVec <- complete.cases(data[, desiredCols])
return(data[completeVec, ])
}
completeFun(DF, "y")
# x y z
# 1 1 0 NA
# 2 2 10 33
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Python name mangling
...ame, age):
self.name = name
self._age = age if age >= 0 else 0
@property
def age(self):
return self._age
@age.setter
def age(self, age):
if age >= 0:
self._age = age
else:
self._age = 0
What about t...
Get DateTime.Now with milliseconds precision
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309
How can I exactly construct a time stamp of actual time with milliseconds precision?
I sus...
Detect Safari browser
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110
You can easily use index of Chrome to filter out Chrome:
var ua = navigator.userAgent.toLowerCa...
Play an audio file using jQuery when a button is clicked
...rrentTime. We will use this line in our example audioElement.currentTime = 0;. To achieve .stop() function we first pause the file then reset its time.
We may want to know the length of the audio file and the current playing time. We already learnt .currentTimeabove, to learn its length we use .dur...
How to make fill height
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answered Aug 22 '10 at 17:22
psayre23psayre23
2,05622 gold badges1313 silver badges99 bronze badges
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HashSet vs. List performance
...ort strings, the advantage went away after size 5, for objects after size 20.
1 item LIST strs time: 617ms
1 item HASHSET strs time: 1332ms
2 item LIST strs time: 781ms
2 item HASHSET strs time: 1354ms
3 item LIST strs time: 950ms
3 item HASHSET strs time: 1405ms
4 item LIST strs time: 1126ms
4 ...
Random strings in Python
...oice(letters) for i in range(length))
Results:
>>> randomword(10)
'vxnxikmhdc'
>>> randomword(10)
'ytqhdohksy'
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How to convert int to char with leading zeros?
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100
Try this: select right('00000' + cast(Your_Field as varchar(5)), 5)
It will get the result in ...