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[apps/graph] Use the poincare derivative calculation to compute function

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derivative

Change-Id: I2b4d9b443935ad789e898e253a22f9d2ab652b6a
This commit is contained in:
Émilie Feral
2017-01-10 12:15:08 +01:00
parent afdc1573b2
commit f4a580884b
5 changed files with 7 additions and 9 deletions
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10
apps/graph/function.cpp
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@@ -83,11 +83,11 @@ float Function::evaluateAtAbscissa(float x, Context * context) const {
}
float Function::approximateDerivative(float x, Context * context) const {
float functionPlus = evaluateAtAbscissa(x + k_epsilon, context);
float functionMinus = evaluateAtAbscissa(x - k_epsilon, context);
float growthRate = (functionPlus - functionMinus)/(2*k_epsilon);
growthRate = roundf(growthRate/k_precision)*k_precision;
return growthRate;
Float abscissa = Float(x);
Expression * args[2] = {m_expression, &abscissa};
Derivative derivative = Derivative();
derivative.setArgument(args, 2, true);
return derivative.approximate(*context);
}
}