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Why does Math.round(0.49999999999999994) return 1?
...Java 7 no longer mandates this broken implementation.3
The problem
0.5+0.49999999999999994 is exactly 1 in double precision:
static void print(double d) {
System.out.printf("%016x\n", Double.doubleToLongBits(d));
}
public static void main(String args[]) {
double a = 0.5;
double b = 0...
How to make Google Chrome JavaScript console persistent?
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If anyone's still looking for this, I'm on Chrome 15.0.874.58 beta-m and I have a checkbox in Developer Tools > Settings labelled "Console: Preserve log on navigation". Does the job nicely.
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Extract elements of list at odd positions
... second at 1 etc.):
1, 3, 5
so the result (actual numbers) will be:
2, 4, 6
Explanation
The [1::2] at the end is just a notation for list slicing. Usually it is in the following form:
some_list[start:stop:step]
If we omitted start, the default (0) would be used. So the first element (at po...
Git number of commits per author on all branches
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answered Mar 23 '12 at 12:48
ralphtheninjaralphtheninja
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iOS - How to set a UISwitch programmatically
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edited May 26 at 18:48
User that is not a user
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answered Oct ...
Pandas get topmost n records within each group
... value
id
1 0 1 1
1 1 2
2 3 2 1
4 2 2
3 7 3 1
4 8 4 1
(Keep in mind that you might need to order/sort before, depending on your data)
EDIT: As mentioned by the questioner, use df.groupby('id').head(2).reset_index(drop=True) to remo...
Possible Loss of Fraction
... Ólafur WaageÓlafur Waage
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Add a new line in file?
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edited Apr 15 '13 at 22:45
answered Aug 19 '10 at 3:10
ma...
How to send only one UDP packet with netcat?
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edited Jul 23 '19 at 20:04
Sean Bright
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chai test array equality doesn't work as expected
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edited Dec 2 '14 at 13:54
answered Jul 8 '13 at 12:53
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