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[apps] Add a function "sumBetweenBounds()" on Function (sum of terms on

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Sequence, Integral on CartesianFunction)
This commit is contained in:
Émilie Feral
2018-01-10 14:35:32 +01:00
committed by EmilieNumworks
parent 7ea0dbeb56
commit cdfbc02499
9 changed files with 17 additions and 10 deletions
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11
apps/graph/cartesian_function.cpp
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@@ -26,6 +26,17 @@ double CartesianFunction::approximateDerivative(double x, Poincare::Context * co
return derivative.approximateToScalar<double>(*context);
}
double CartesianFunction::sumBetweenBounds(double start, double end, Poincare::Context * context) const {
Poincare::Complex<double> x = Poincare::Complex<double>::Float(start);
Poincare::Complex<double> y = Poincare::Complex<double>::Float(end);
Poincare::Expression * args[3] = {expression(context), &x, &y};
Poincare::Integral integral(args, true);
/* TODO: when we will simplify integral, we might want to simplify the
* integral here. However, we might want to do it once for all x (to avoid
* lagging in the derivative table. */
return integral.approximateToScalar<double>(*context);
}
char CartesianFunction::symbol() const {
return 'x';
}