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How to apply a function to two columns of Pandas dataframe
...s Series object, and then index the Series to get the values needed.
In [49]: df
Out[49]:
0 1
0 1.000000 0.000000
1 -0.494375 0.570994
2 1.000000 0.000000
3 1.876360 -0.229738
4 1.000000 0.000000
In [50]: def f(x):
....: return x[0] + x[1]
....:
In [51]:...
Java integer to byte array
I got an integer: 1695609641
13 Answers
13
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Convert decimal to hexadecimal in UNIX shell script
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echo "obase=16; 34" | bc
If you want to filter a whole file of integers, one per line:
( echo "obase=16" ; cat file_of_integers ) | bc
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How to run a python script from IDLE interactive shell?
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145
Python3:
exec(open('helloworld.py').read())
If your file not in the same dir:
exec(open('./...
Ruby function to remove all white spaces?
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54
\s+ means 1 or more whitespace characters (space, newline, tab). The // surrounding show that it's a regular expression.
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Replacing instances of a character in a string
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answered Oct 4 '12 at 9:01
Martijn Pieters♦Martijn Pieters
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How to check if an element is in an array
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Swift 2, 3, 4, 5:
let elements = [1, 2, 3, 4, 5]
if elements.contains(5) {
print("yes")
}
contains() is a protocol extension method of SequenceType (for sequences of Equatable elements) and not a global method as in
earlier releas...
Make the current Git branch a master branch
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14 Answers
14
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Easiest way to check for an index or a key in an array?
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answered Nov 4 '12 at 18:25
doubleDowndoubleDown
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A Regex that will never be matched by anything
...nd only then not find the "a" and return a negative match. I see it take ~480ms to scan a ~275k line file. The converse "a^" takes about the same time, even if it might seem more efficient. On the other hand, a negative lookahead need not scan anything: "(?!x)x" (anything not followed by an x als...