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Truncate a list to a given number of elements
What method truncates a list--for example to the first 100 elements--discarding the others (without iterating through individual elements)?
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Why was the arguments.callee.caller property deprecated in JavaScript?
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// This snippet will work:
function factorial(n) {
return (!(n>1))? 1 : factorial(n-1)*n;
}
[1,2,3,4,5].map(factorial);
// But this snippet will not:
[1,2,3,4,5].map(function(n) {
return (!(n>1))? 1 : /* what goes here? */ (n-1)*n;
});
To get around this, arguments.calle...
how do you filter pandas dataframes by multiple columns
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176
Using & operator, don't forget to wrap the sub-statements with ():
males = df[(df[Gender]...
SQL how to increase or decrease one for a int column in one command
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To answer the first:
UPDATE Orders SET Quantity = Quantity + 1 WHERE ...
To answer the second:
There are several ways to do this. Since you did not specify a database, I will assume MySQL.
INSERT INTO table SET x=1, y=2 ON DUPLICATE KEY UPDATE x=x+1, y=y+2
REPLACE INTO table SET ...
Use find command but exclude files in two directories
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189
Here's how you can specify that with find:
find . -type f -name "*_peaks.bed" ! -path "./tmp/...
How to get Scala List from Java List?
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178
EDIT: Note that this is deprecated since 2.12.0. Use JavaConverters instead. (comment by @Yaro...
JdbcTemplate queryForInt/Long is deprecated in Spring 3.2.2. What should it be replaced by?
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110
What I think is that somebody realized that the queryForInt/Long methods has confusing semanti...
Sequence contains more than one element
... This method will only succeed when the collections contains exactly 0 or 1 element. I believe you are looking for FirstOrDefault which will succeed no matter how many elements are in the collection.
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How to get the index of a maximum element in a numpy array along one axis
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144
>>> a.argmax(axis=0)
array([1, 1, 0])
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