It was shown in Chapter 7 that integrals, which may need to be evaluated numerically, are of the form
In finite element analysis, ‘Gauss Quadrature’ procedure is used extensively for numerical integration.
Consider a simple curve shown in Figure D.1. Application of trapezoidal rule is shown in Part (a) of the figure to evaluate area under the curve between the limits of a and b. The area of the trapezoid is given by