error: int = quadndg('Fun',xlow,xhigh) or int = quadndg('Fun',xlow,xhigh,tol) This function is similar to QUAD or QUAD8 for n-dimensional integration, but it uses a Gaussian quadrature integration scheme. int -- value of the integral Fun -- Fun(x) (function to be integrated) in this case treat all the different values of x as different variables as opposed to different instances of the same variable x -- n length vector of coordinates xlow -- n length vector of lower limits of integration xhigh -- n length vector of upper limits of integration tol -- tolerance parameter (optional) Note that if there are discontinuities the region of integration should be broken up into separate pieces. And if there are singularities, a more appropriate integration quadrature should be used (such as the Gauss-Chebyshev for a specific type of singularity).

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