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Regex exactly n OR m times
Consider the following regular expression, where X is any regex.
6 Answers
6
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Getting and removing the first character of a string
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See ?substring.
x <- 'hello stackoverflow'
substring(x, 1, 1)
## [1] "h"
substring(x, 2)
## [1] "ello stackoverflow"
The idea of having a pop method that both returns a value and has a side effect of updating the data stored in x is v...
Python function global variables?
... In the code that I gave, is func_B doing things (1) to the global copy of x (as gotten from func_A), (2) to a local variable x with the same value of the result of func_A, or (3) to a local variable x with no value and (in the eyes of the compiler) no relation to "some value" or the x in func_A?
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Multiple linear regression in Python
...o regress my dependent variable (y) against several independent variables (x1, x2, x3, etc.).
13 Answers
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List of lists changes reflected across sublists unexpectedly
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When you write [x]*3 you get, essentially, the list [x, x, x]. That is, a list with 3 references to the same x. When you then modify this single x it is visible via all three references to it:
x = [1] * 4
l = [x] * 3
print(f"id(x): {id(x)}"...
Convert from ASCII string encoded in Hex to plain ASCII?
How can I convert from hex to plain ASCII in Python?
8 Answers
8
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Call apply-like function on each row of dataframe with multiple arguments from each row
...d the input of the function is using multiple columns from that row. For example, let's say I have this data and this testFunc which accepts two args:
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How to map atan2() to degrees 0-360
atan2(y, x) has that discontinuity at 180° where it switches to -180°..0° going clockwise.
15 Answers
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Convert a negative number to a positive one in JavaScript
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You could use this...
Math.abs(x)
Math.abs() | MDN
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Fastest way to determine if an integer's square root is an integer
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