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Python package ismember returns array elements that are members of set array.

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ismember is a Python library that checks whether the elements in X is present in Y.

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Documentation pages

On the documentation pages you can find more information about ismember with examples.

Install bnlearn from PyPI
pip install ismember     # normal install
pip install -U ismember  # update if needed

Import ismember package

from ismember import ismember

Example: Check whether the elements of X are present in Y

Example: Determine the corresponding location of the values that are present in Y array

Example: Row wise comparison

Example: Elementwise comparison

Quick examples

import numpy as np
from ismember import ismember

# Example with lists
a_vec  = [1,2,3,None]
b_vec  = [4,1,2]
[I,idx] = ismember(a_vec,b_vec)
# Example with DataFrames
a_vec = pd.DataFrame(['aap','None','mies','aap','boom','mies',None,'mies','mies','pies',None])
b_vec = pd.DataFrame([None,'mies','mies','pies',None])
I, idx = ismember(a_vec,b_vec)
# Example with Numpy array
a_vec = np.array(['boom','aap','mies','aap'])
b_vec = np.array(['aap','boom','aap'])
I, idx = ismember(a_vec,b_vec)



  • Erdogan Taskesen, github: erdogant
  • Contributions are welcome.
  • If you wish to buy me a Coffee for this work, it is very appreciated :)

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