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[apps/graph] Add method to approximate the derivative function at a

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given abscissa

Change-Id: I31bbd99a0469f7fad140a38dae1783b2d2ee414d
This commit is contained in:
Émilie Feral
2016-10-19 15:17:35 +02:00
parent c83060b5b1
commit 4653f9ff52
2 changed files with 11 additions and 2 deletions
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9
apps/graph/function.cpp
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@@ -61,9 +61,16 @@ void Function::setActive(bool active) {
m_active = active;
}
float Function::evaluateAtAbscissa(float x, EvaluateContext * context) {
float Function::evaluateAtAbscissa(float x, EvaluateContext * context) const {
context->setOverridenValueForSymbolX(x);
return m_expression->approximate(*context);
}
float Function::approximateDerivative(float x, EvaluateContext * context) const {
float functionPlus = evaluateAtAbscissa(x + k_epsilon, context);
float functionMinus = evaluateAtAbscissa(x - k_epsilon, context);
float growthRate = (functionPlus - functionMinus)/(2*k_epsilon);
return growthRate;
}
}