fixing appredict error (#240)

* fixing appredict error

RELEASE.md

@@ -1,7 +1,7 @@
-# Release 0.9.8
+# Release 0.9.9
 - Fixed an issue with unused variables appearing in common terms in jacobians.
-- Fixes a bug printing large integers, in some environments: Large numbers such as 8.034023767017109e+27 whch were actually ints would be printed as an the int 8034023767017108950029959168 and then the C++ compiler would complain as that's more than the maximum int value. This has been fixed by only printing ints as ints if they are `MIN_INT < number < MAX_INT` else we print them as a float (and we get the sceintific notation).
-- Fixed tests to pass with sympy 1.10 and required latest cellmlmanip, which also workes with sympy1.10. Updated sympy requirement to be >=1.9, < 1.11
+- Fixes a bug printing large integers, in some environments: Large numbers such as 8.034023767017109e+27 which were actually ints would be printed as an the int 8034023767017108950029959168 and then the C++ compiler would complain as that's more than the maximum int value. This has been fixed by only printing ints as ints if they are `MIN_INT < number < MAX_INT` else we print them as a float (and we get the sceintific notation).
+- Fixed tests to pass with sympy 1.10 and required latest cellmlmanip, which also works with sympy1.10. Updated sympy requirement to be >=1.9, < 1.11
 
 # Release 0.9.5
 - Corrected a type in the generated output for `--rush-larsen-c`

chaste_codegen/_partial_eval.py

@@ -5,13 +5,10 @@
     Float,
     Piecewise,
     cse,
-    exp,
     piecewise_fold,
 )
 from sympy.core import Symbol
 
-from chaste_codegen._math_functions import exp_
-
 
 def get_usage_count(equations):
     """Counts the amount of times the lhs for each eq is used on the rhs in the set of equations following it.
@@ -36,12 +33,10 @@ def fold_piecewises(expr):
     # Since piecewise_fold hangs with some complicated nestings, due to simplification we use the following workaround:
     # First extract common terms, perform piecewise_fold, re-insert the common terms
     # see: https://github.com/sympy/sympy/issues/20850
-    expr = expr.replace(exp, exp_)
     common_terms, expr = cse(expr)
     expr = piecewise_fold(expr[0])
     for term, ex in reversed(common_terms):
         expr = expr.xreplace({term: ex})
-    expr = expr.replace(exp_, exp)
     return expr