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How can I group by date time column without taking time into consideration
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answered May 19 '11 at 5:26
OdedOded
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Sort array of objects by single key with date value
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358
You can use Array.sort.
Here's an example:
var arr = [{
"updated_at": "2012-01-01T06:...
Programmatically create a UIView with color gradient
...ive-C:
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 50)];
CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = view.bounds;
gradient.colors = @[(id)[UIColor whiteColor].CGColor, (id)[UIColor blackColor].CGColor];
[view.layer insertSublayer:gradient atIndex:0...
Accessing inactive union member and undefined behavior?
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5 Answers
5
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What integer hash function are good that accepts an integer hash key?
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Knuth's multiplicative method:
hash(i)=i*2654435761 mod 2^32
In general, you should pick a multiplier that is in the order of your hash size (2^32 in the example) and has no common factors with it. This way the hash function covers all your hash space uniformly.
Ed...
Label encoding across multiple columns in scikit-learn
...o encode a pandas DataFrame of string labels. As the dataframe has many (50+) columns, I want to avoid creating a LabelEncoder object for each column; I'd rather just have one big LabelEncoder objects that works across all my columns of data.
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Can Mockito capture arguments of a method called multiple times?
...e() == "Jane" , see also groups.google.com/forum/#!msg/mockito/KBRocVedYT0/5HtARMl9r2wJ.
– asmaier
Dec 4 '14 at 14:46
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Does Java 8 provide a good way to repeat a value or function?
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5 Answers
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What does -1 mean in numpy reshape?
...oned criteria
Now see the example.
z = np.array([[1, 2, 3, 4],
[5, 6, 7, 8],
[9, 10, 11, 12]])
z.shape
(3, 4)
Now trying to reshape with (-1) . Result new shape is (12,) and is compatible with original shape (3,4)
z.reshape(-1)
array([ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1...
Why is Double.MIN_VALUE in not negative
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The IEEE 754 format has one bit reserved for the sign and the remaining bits representing the magnitude. This means that it is "symmetrical" around origo (as opposed to the Integer values, which have one more negative value). Thus the ...