Replace min/max disguised as piecewise#3053
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dweindl merged 1 commit intoAMICI-dev:mainfrom Nov 18, 2025
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## main #3053 +/- ##
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- Coverage 78.14% 77.47% -0.68%
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Files 311 311
Lines 20593 20602 +9
Branches 1499 1499
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- Misses 4491 4631 +140
Partials 10 10
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FFroehlich
reviewed
Nov 18, 2025
| # piecewise to heavisides | ||
| if piecewise_to_heaviside: | ||
| try: | ||
| expr = expr.replace(sp.Piecewise, _piecewise_to_minmax) |
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also add small test with actual model to make sure that we are not reverting this substitution someplace else?
FFroehlich
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Nov 18, 2025
During model import, simplify piecewise functions that can be expressed as min()/max(). So far, all piecewise constructs are treated as discontinuous (see also AMICI-dev#2049). For min/max, only the derivative is discontinuous, which currently does not receive any special treatment in amici (see also https://amici.readthedocs.io/en/latest/implementation_discontinuities.html). So this change prevents root tracking for some unnecessary piecewises. Addresses some aspects of AMICI-dev#2049.
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During model import, simplify piecewise functions that can be expressed as min()/max().
So far, all piecewise constructs are treated as discontinuous (see also #2049). For min/max, only the derivative is discontinuous, which currently does not receive any special treatment in amici (see also https://amici.readthedocs.io/en/latest/implementation_discontinuities.html).
So this change prevents root tracking for some unnecessary piecewises. Addresses some aspects of #2049.