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Jiri (George) Lebl authored
* lib/calculus/fourier.gel: add NumericalFourierCosineSeriesFunction and NumericalFourierSineSeriesFunction and fixup some doc stringss * src/eval.c, src/dict.c: build the subst_dict on first function evaluate. This avoids subst lists for simple functions, plus it makes the global identifier no-substitution behaviour slightly more easy to see.
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