JohnE

JohnE has asked 20 questions and find answers to 139 problems.

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~~Applied Economist~~

Data Scientist

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JohnE questions

Pointers as components of derived types
Faster alternative to grouby/shift
Select only the column names that contain a specific string
Reading encrypted files into pandas
Decrypting a file to a stream and reading the stream into pandas (hdf or stata)
Segmentation fault for array, but only if a component of a derived type
Correctly setting random seeds for repeatability
Distribution-type graphs (histogram/kde) with weighted data
Map vs applymap when passing a dictionary
Minimize quadratic function subject to linear equality constraints with SciPy

JohnE answers

NotImplementedError: fill_value 0 not supported
sort pandas value_counts() primarily by descending counts and secondarily by ascending values
Create symmetric matrix from pandas data frame
split each cell in dataframe (pandas/python)
Percentage match in pandas Dataframe
Using latest panda APIs to compute exponential moving average
chunksize isn't starting from first row in csv file
pandas apply with inputs from multiple rows
Mark interpolated NaN points in Pandas plot
Python pandas - select rows based on groupby