refs#16

- Fixed Gauss-Legendre

src/NumA/integration/one_dimension/QuadratureIntegrator1D.cpp

@@ -32,8 +32,8 @@ double QuadratureIntegrator1D::integrate(FunctionType1D* pFunction, double a,
     for (unsigned int i = 0; i < m_nodes.size(); i++) {
         x1 = m_a + m_b * m_nodes[i];
         x2 = m_a - m_b * m_nodes[i];
-        result += (*pFunction)(x1, parameters)
-                + (*pFunction)(x2, parameters) * m_weights[i];
+        result += ((*pFunction)(x1, parameters) + (*pFunction)(x2, parameters))
+                * m_weights[i];
     }
     // Multiplying by the step at the end to save computing time
     result = result * m_b;