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[apps/graph] Fix bug

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Change-Id: I13cebe8a1067e09e0b7aac0a613ffe8aab23f60b
This commit is contained in:
Émilie Feral
2017-05-30 10:16:36 +02:00
parent 1d0658141a
commit 3af8c86504
1 changed files with 1 additions and 1 deletions
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apps/graph/cartesian_function.cpp
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@@ -18,7 +18,7 @@ void CartesianFunction::setDisplayDerivative(bool display) {
float CartesianFunction::approximateDerivative(float x, Poincare::Context * context) const {
Poincare::Complex abscissa = Poincare::Complex::Float(x);
Poincare::Expression * args[2] = {m_expression, &abscissa};
Poincare::Expression * args[2] = {expression(), &abscissa};
Poincare::Derivative derivative;
derivative.setArgument(args, 2, true);
return derivative.approximate(*context);