example1.m

function [f,g]=example1(x,a)
%EXAMPLE1   Example function for Poblano Toolbox routines.
%
%  [F,G] = EXAMPLE1(X) computes F = sin(X(N)) + ... sin(X(N)) and G, the 
%  gradient of F at X, where N is the number of variables in X.
%
%  [F,G] = EXAMPLE1(X,A) computes F = sin(A*X(1)) + ... + sin(A*X(N)) and G, 
%  the gradient of F at X.
%
%Poblano Toolbox for MATLAB
%
%Copyright 2009 National Technology & Engineering Solutions of Sandia,
%LLC (NTESS). Under the terms of Contract DE-NA0003525 with NTESS, the
%U.S. Government retains certain rights in this software.

if (nargin < 2), a = 1; end
f = sum(sin(a*x));
g = a*cos(a*x);