Mark get_variable_indices_from_variable as deprecated

1 files changed, 4 insertions, 2 deletions

diff --git a/polymatrix/expression/utils/getvariableindices.py b/polymatrix/expression/utils/getvariableindices.py
index aebdeb0..d87f82e 100644
--- a/polymatrix/expression/utils/getvariableindices.py
+++ b/polymatrix/expression/utils/getvariableindices.py
@@ -3,15 +3,17 @@ import typing
 
 from polymatrix.expressionstate.abc import ExpressionState
 from polymatrix.expression.mixins.expressionbasemixin import ExpressionBaseMixin
+from polymatrix.utils.deprecation import deprecated
 
 
 # NP: very confusing name without explaination / context
 # NP: why is this not a feature of expressionstate?
-# FIXME: typing, especially return type
+@deprecated("Replaced by helper methods in ExpressionState")
 def get_variable_indices_from_variable(
     state: ExpressionState,
     variable: ExpressionBaseMixin | int | typing.Any,
 ) -> tuple[int, ...] | None:
+
     if isinstance(variable, ExpressionBaseMixin):
         state, variable_polynomial = variable.apply(state)
 
@@ -50,7 +52,7 @@ def get_variable_indices_from_variable(
     return state, variable_indices
 
 
-# not used, remove?
+@deprecated("Replaced by helper methods in ExpressionState")
 def get_variable_indices(state, variables):
     if not isinstance(variables, tuple):
         variables = (variables,)