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get list from pandas dataframe column
...st it with list(x).
import pandas as pd
data_dict = {'one': pd.Series([1, 2, 3], index=['a', 'b', 'c']),
'two': pd.Series([1, 2, 3, 4], index=['a', 'b', 'c', 'd'])}
df = pd.DataFrame(data_dict)
print(f"DataFrame:\n{df}\n")
print(f"column types:\n{df.dtypes}")
col_one_list = df['one'...
How do I declare and initialize an array in Java?
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28 Answers
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How to check if hex color is “too black”?
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227
You have to extract the three RGB components individually, and then use a standard formula to ...
The $.param( ) inverse function in JavaScript / jQuery
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62
You should use jQuery BBQ's deparam function. It's well-tested and documented.
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finding and replacing elements in a list
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266
>>> a= [1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1]
>>> for n, i in enumerate(a):
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Elegant way to invert a map in Scala
... values are unique, this works:
(Map() ++ origMap.map(_.swap))
On Scala 2.8, however, it's easier:
origMap.map(_.swap)
Being able to do that is part of the reason why Scala 2.8 has a new collection library.
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Get statistics for each group (such as count, mean, etc) using pandas GroupBy?
...ethods at once. This should give you the result you need:
df[['col1', 'col2', 'col3', 'col4']].groupby(['col1', 'col2']).agg(['mean', 'count'])
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Calculate distance between two latitude-longitude points? (Haversine formula)
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pyplot scatter plot marker size
...the marker you need to increase s by a factor of 4. [because A = WH => (2W)(2H)=4A]
There is a reason, however, that the size of markers is defined in this way. Because of the scaling of area as the square of width, doubling the width actually appears to increase the size by more than a factor ...