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How to drop columns by name in a data frame
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389
You should use either indexing or the subset function. For example :
R> df <- data.frame...
Check substring exists in a string in C
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280
if(strstr(sent, word) != NULL) {
/* ... */
}
Note that strstr returns a pointer to the st...
Does a valid XML file require an XML declaration?
... of Xerces.
Is the XML declaration <?xml version="1.0" encoding="UTF-8"?> required?
3 Answers
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Why does (“foo” === new String(“foo”)) evaluate to false in JavaScript?
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answered Jun 8 '12 at 15:39
SLaksSLaks
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Sort objects in ArrayList by date?
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answered May 8 '11 at 12:29
DomchiDomchi
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Class JavaLaunchHelper is implemented in both … libinstrument.dylib. One of the two will be used. Wh
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muttonUp
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answered Apr 22 '17 at 18:27
user5683940user568...
What does value & 0xff do in Java?
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It sets result to the (unsigned) value resulting from putting the 8 bits of value in the lowest 8 bits of result.
The reason something like this is necessary is that byte is a signed type in Java. If you just wrote:
int result = value;
then result would end up with the value ff ff ff fe...
What does this square bracket and parenthesis bracket notation mean [first1,last1)?
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answered Dec 9 '10 at 8:41
Michael MrozekMichael Mrozek
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How to reliably guess the encoding between MacRoman, CP1252, Latin1, UTF-8, and ASCII
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86
First, the easy cases:
ASCII
If your data contains no bytes above 0x7F, then it's ASCII. (Or...
Split delimited strings in a column and insert as new rows [duplicate]
... 1 a
## 2 1 b
## 3 1 c
## 4 2 a
## 5 2 c
## 6 3 b
## 7 3 d
## 8 4 e
## 9 4 f
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