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Selecting pandas column by location
... to mind:
>>> df
A B C D
0 0.424634 1.716633 0.282734 2.086944
1 -1.325816 2.056277 2.583704 -0.776403
2 1.457809 -0.407279 -1.560583 -1.316246
3 -0.757134 -1.321025 1.325853 -2.513373
4 1.366180 -1.265185 -2.184617 0.881514
>>> df.iloc[...
Regex to validate date format dd/mm/yyyy
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20 Answers
20
Active
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From ND to 1D arrays
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283
Use np.ravel (for a 1D view) or np.ndarray.flatten (for a 1D copy) or np.ndarray.flat (for an ...
What's the 'Ruby way' to iterate over two arrays at once
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277
>> @budget = [ 100, 150, 25, 105 ]
=> [100, 150, 25, 105]
>> @actual = [ 120, 1...
Uninstall old versions of Ruby gems
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edited Dec 28 '13 at 23:39
Steven Penny
76.1k4545 gold badges296296 silver badges336336 bronze badges
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How to form tuple column from two columns in Pandas
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208
Get comfortable with zip. It comes in handy when dealing with column data.
df['new_col'] = l...
What's the difference between lists enclosed by square brackets and parentheses in Python?
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278
Square brackets are lists while parentheses are tuples.
A list is mutable, meaning you can ch...
How to reorder data.table columns (without copying)
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2 Answers
2
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Pass a data.frame column name to a function
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You can just use the column name directly:
df <- data.frame(A=1:10, B=2:11, C=3:12)
fun1 <- function(x, column){
max(x[,column])
}
fun1(df, "B")
fun1(df, c("B","A"))
There's no need to use substitute, eval, etc.
You can even pass the desired function as a parameter:
fun1 <- function...
How to add title to subplots in Matplotlib?
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225
ax.title.set_text('My Plot Title') seems to work too.
fig = plt.figure()
ax1 = fig.add_subplo...