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Numpy - add row to array

... 122 What is X? If it is a 2D-array, how can you then compare its row to a number: i < 3? EDIT a...
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How do I declare and initialize an array in Java?

... 28 Answers 28 Active ...
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How to check if hex color is “too black”?

... 227 You have to extract the three RGB components individually, and then use a standard formula to ...
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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'...
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finding and replacing elements in a list

... 266 >>> a= [1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1] >>> for n, i in enumerate(a): ... ...
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The $.param( ) inverse function in JavaScript / jQuery

... 62 You should use jQuery BBQ's deparam function. It's well-tested and documented. ...
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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. share ...
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Too many 'if' statements?

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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']) share | improve this answer | ...
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Calculate distance between two latitude-longitude points? (Haversine formula)

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