function fx = p25_fun ( n, x ) %*****************************************************************************80 % %% P25_FUN evaluates the integrand for problem 25. % % Interval: % % 0 <= x <= 1. % % Integrand: % % ln ( abs ( x - 0.7 ) ) % % Exact Integral: % % 0.3 * ln ( 0.3 ) + 0.7 * ln ( 0.7 ) - 1 % % Approximate Integral (20 digits): % % -1.6108643020548934630 % % Licensing: % % This code is distributed under the GNU LGPL license. % % Modified: % % 03 November 2009 % % Author: % % John Burkardt % % Reference: % % Kendall Atkinson, % An Introduction to Numerical Analysis, % Prentice Hall, 1984, page 303. % % Parameters: % % Input, integer N, the number of evaluation points. % % Input, real X(N), the evaluation points. % % Output, real FX(N), the integrand values. % fx = log ( abs ( x - 0.7 ) ); return end