function [y] = runge(x) % Accompanying program for the text % % Classical and Modern Numerical Analysis: % Theory, Methods and Practice % by Azmy S. Ackleh, Edward J. Allen, % R. Baker Kearfott, and Padmanabhan Seshaiyer % % (Taylor and Francis / CRC Press, 2009) % % [y] = runge(x) % % returns Runge's function at the argument x. If x is a vector, then, upon % return, y will contain the vector of evaluations of Runge's function at % corresponding components of x. In such a case, y will be a row vector if % x is a row vector, and y will be a column vector if x is a column vector. y = 1./(1+x.^2); return