annulus_rule_test, a Fortran90 code which calls annulus_rule(), which computes a quadrature rule over the interior of the annulus in 2D, with center (XC,YC), inner radius R1 and outer radius R2.
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annulus_rule, a Fortran90 code which computes a quadrature rule for estimating integrals of a function over the interior of a circular annulus in 2D.