How to find common edges from a binary dataframe?

Question:

This is my dataset:

Dept Cell culture Bioinfo Immunology Trigonometry Algebra Biotech Optics
Biotech 1 1 1 0 0 1 0
Math 0 0 0 1 1 0 0
Physics 0 0 0 0 0 0 1

How I want my result:

Dept 0
Biotech Cell culture
Biotech Bioinfo
Biotech Immunology
Math Trigonometry
Math Algebra
Physics Optics

I need to form pairs that have the value one, but I also need to rid of those values which are the same in both column and row index – such as biotech here. Is there an easy way to do this?

Asked By: Mimikyu o_0

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Source

Answers:

Try this:

#df = df.set_index('Dept') if needed move dept into the index
df.dot(df.columns+',').str.strip(',').str.split(',').explode().reset_index()

Output:

      Dept             0
0  Biotech  Cell culture
1  Biotech       Bioinfo
2  Biotech    Immunology
3  Biotech       Biotech
4     Math  Trigonometry
5     Math       Algebra
6  Physics        Optics
Answered By: Scott Boston