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Cannot copy() a float or a sympy Number #95

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3 changes: 3 additions & 0 deletions odetoolbox/singularity_detection.py
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Original file line number Diff line number Diff line change
Expand Up @@ -101,6 +101,9 @@ def _is_matrix_defined_under_substitution(A: sympy.Matrix, cond_set: Set[Symmetr
a set with equations, where the left-hand side of each equation is the variable that is to be subsituted, and the right-hand side is the expression to put in its place
"""
for val in sympy.flatten(A):
if isinstance(val, float) or isinstance(val, int) or isinstance(val, sympy.core.numbers.Number):
continue

expr_sub = val.copy()
for eq in cond_set:
expr_sub = expr_sub.subs(eq.lhs, eq.rhs)
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