Gauss quadrature and Christoffel function for a lower subrange exponential integral weight function

<p>MATLAB software is provided for generating to any given accuracy <em>n</em>-point Gauss quadrature rules, <em>n</em> ≥ 1, relative to a lower subrange exponential integral weight function as well as approximations and respective errors for  the quadrature weights and for the Christoffel function.</p>