SymPy | Subset.prev_binary() in Python

SymPy | Subset.prev_binary() in Python

SymPy's Subset class in the combinatorics module provides methods to work with subsets. One such method is prev_binary(), which gives the preceding subset in a lexicographical ordering of subsets represented in binary.

Here's a simple guide on how to use prev_binary() with the Subset class in SymPy:

  1. Install and Import Necessary Libraries:

    If you haven't installed SymPy yet:

    pip install sympy

    Now, import the required class:

    from sympy.combinatorics.subset import Subset

  2. Initialize a Subset:

    universe = [0, 1, 2, 3]
subset_elements = [1, 3]
subset = Subset(subset_elements, universe)

  3. Use prev_binary() Method:

    previous_subset_binary = subset.prev_binary()
print(previous_subset_binary)

This will output the preceding subset (in binary representation) of the current subset when subsets of the universe are considered in a lexicographical order.

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