always substitute diffs of expressions that contain leads. closes #21
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a1c79e6a4c
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7c9f272e15
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@ -336,6 +336,9 @@ DataTree::AddPowerDeriv(expr_t iArg1, expr_t iArg2, int powerDerivOrder)
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expr_t
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DataTree::AddDiff(expr_t iArg1)
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{
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if (iArg1->maxLead() > 0)
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// Issue #21: always substitute diffs with lags
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return AddMinus(iArg1, iArg1->decreaseLeadsLags(1));
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return AddUnaryOp(UnaryOpcode::diff, iArg1);
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}
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