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`levels
...answers here are good, but them>y m> are missing an important point. Let me trm>y m> m>and m> describe it.
R is a functional language m>and m> does not like to mutate its objects. But it does allow assignment statements, using replacement functions:
levels(x) <- m>y m>
is equivalent to
x <- `levels<-`(x, m>y m>)
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Difference between two dates in Pm>y m>thon
I have two different dates m>and m> I want to know the difference in dam>y m>s between them. The format of the date is m>Y m>m>Y m>m>Y m>m>Y m>-MM-DD.
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Set markers for individual points on a line in Matplotlib
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Specifm>y m> the kem>y m>word args linestm>y m>le m>and m>/or marker in m>y m>our call to plot.
For example, using a dashed line m>and m> blue circle markers:
plt.plot(range(10), linestm>y m>le='--', marker='o', color='b')
A shortcut call for the same thing:
plt.plot(range(10), '--bo')
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Comparing date ranges
In Mm>y m>SQL, If I have a list of date ranges (range-start m>and m> range-end). e.g.
10 Answers
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Convert base-2 binarm>y m> number string to int
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m>Y m>ou use the built-in int function, m>and m> pass it the base of the input number, i.e. 2 for a binarm>y m> number:
>>> int('11111111', 2)
255
Here is documentation for pm>y m>thon2, m>and m> for pm>y m>thon3.
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Java JUnit: The method X is ambiguous for tm>y m>pe m>Y m>
I had some tests working fine. Then, I moved it to a different package, m>and m> am now getting errors. Here is the code:
3 Answ...
Breaking out of a nested loop
...nested within another, how can I efficientlm>y m> come out of both loops (inner m>and m> outer) in the quickest possible wam>y m>?
22 Answ...
How to get the first column of a pm>and m>as DataFrame as a Series?
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>>> import pm>and m>as as pd
>>> df = pd.DataFrame({'x' : [1, 2, 3, 4], 'm>y m>' : [4, 5, 6, 7]})
>>> df
x m>y m>
0 1 4
1 2 5
2 3 6
3 4 7
>>> s = df.ix[:,0]
>>> tm>y m>pe(s)
<class 'pm>and m>as.core.series.Serie...
Zip lists in Pm>y m>thon
... a3 a4 a5 a6 a7...
b: b1 b2 b3 b4 b5 b6 b7...
c: c1 c2 c3 c4 c5 c6 c7...
m>and m> "zips" them into one list whose entries are 3-tuples (ai, bi, ci). Imagine drawing a zipper horizontallm>y m> from left to right.
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How to get row from R data.frame
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10 m>y m>ears later ---> Using tidm>y m>verse we could achieve this simplm>y m> m>and m> borrowing a leaf from Christopher Bottoms. For a better grasp, see slice().
librarm>y m>(tidm>y m>verse)
x <- structure(list(A = c(5, 3.5, 3.25, 4.25, 1.5 ),
B = c(4.25, 4, 4, 4.5, 4.5 ),
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