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How to express infinity in Ruby?
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188
If you use ruby 1.9.2, you can use:
>> Float::INFINITY #=> Infinity
>> 3 < ...
What does the caret operator (^) in Python do?
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177
It's a bitwise XOR (exclusive OR).
It results to true if one (and only one) of the operands (...
Extract elements of list at odd positions
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Solution
Yes, you can:
l = L[1::2]
And this is all. The result will contain the elements placed on the following positions (0-based, so first element is at position 0, second at 1 etc.):
1, 3, 5
so the result (actual numbers) will be:
2, 4, 6
Exp...
Easiest way to upgrade eclipse 3.7 to 4.2 (Juno)
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157
Eclipse can barely update from 3.7.1 to 3.7.2, never mind from 3.7 to 4.2.
You're taking the ...
in_array multiple values
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answered Sep 24 '11 at 23:51
Mark ElliotMark Elliot
65.9k1818 gold badges132132 silver badges155155 bronze badges
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How to create a density plot in matplotlib?
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124
Sven has shown how to use the class gaussian_kde from Scipy, but you will notice that it doesn...
How can I plot with 2 different y-axes?
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127
update: Copied material that was on the R wiki at http://rwiki.sciviews.org/doku.php?id=tips:g...
how do I insert a column at a specific column index in pandas?
... the beginning
df.insert(loc, column, value)
df = pd.DataFrame({'B': [1, 2, 3], 'C': [4, 5, 6]})
df
Out:
B C
0 1 4
1 2 5
2 3 6
idx = 0
new_col = [7, 8, 9] # can be a list, a Series, an array or a scalar
df.insert(loc=idx, column='A', value=new_col)
df
Out:
A B C
0 7 1 ...
Rename specific column(s) in pandas
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edited May 23 '17 at 12:34
Community♦
111 silver badge
answered Nov 3 '13 at 21:32
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How to use the 'sweep' function
...nd use in the operation defined by FUN.
For instance, if you want to add 1 to the 1st row, 2 to the 2nd, etc. of the matrix you defined, you will do:
sweep (M, 1, c(1: 4), "+")
I frankly did not understand the definition in the R documentation either, I just learned by looking up examples.
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