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How to avoid reinstalling packages when building Docker image for Python projects?
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143
Try to build a Dockerfile which looks something like this:
FROM my/base
WORKDIR /srv
ADD ./requ...
How to create the most compact mapping n → isprime(n) up to a limit N?
...number with one bit e.g. for the given range of numbers (1, 10], starts at 3: 1110
31 Answers
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Why does (0 < 5 < 3) return true?
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443
Order of operations causes (0 &lt; 5 &lt; 3) to be interpreted in javascript as ((0 &lt; 5) &lt;...
What are the mathematical/computational principles behind this game?
...nd you have the question:
Can we have a geometry with just 2 points? With 3 points? With 4? With 7?
There are still open questions regarding this problem but we do know this:
If there are geometries with Q points, then Q = n^2 + n + 1 and n is called the order of the geometry.
There are n+1 poin...
What's the best way to send a signal to all members of a process group?
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33 Answers
33
Active
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Formatting floats without trailing zeros
...rtelli
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how do I insert a column at a specific column index in pandas?
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388
see docs: http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.insert.html
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Can dplyr package be used for conditional mutating?
... 1 &amp; b == 4), 2,
ifelse(a == 0 | a == 1 | a == 4 | a == 3 | c == 4, 3, NA)))
Added - if_else: Note that in dplyr 0.5 there is an if_else function defined so an alternative would be to replace ifelse with if_else; however, note that since if_else is stricter than ifelse (both leg...
Getting the array length of a 2D array in Java
...tring[] args) {
int[][] foo = new int[][] {
new int[] { 1, 2, 3 },
new int[] { 1, 2, 3, 4},
};
System.out.println(foo.length); //2
System.out.println(foo[0].length); //3
System.out.println(foo[1].length); //4
}
Column lengths differ per row. If you're backing...
How to print a number with commas as thousands separators in JavaScript
...h commas as thousands separators. For example, I want to show the number 1234567 as "1,234,567". How would I go about doing this?
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