# Author : Pierre Schnizer import sys import unittest import pygsl._numobj as Numeric from pygsl import Float import pygsl #print pygsl #multiroots = pygsl.roots.multiroots from pygsl import multiroots import copy def rosenbrock_f(x, params): a = params[0] b = params[1] y = copy.copy(x) y[0] = a * (1 - x[0]) y[1] = b * (x[1] - x[0] * x[0]) return y def rosenbrock_df(x, params): a = params[0] b = params[1] df = Numeric.zeros((x.shape[0], x.shape[0]), Float) df[0,0] = -a df[0,1] = 0 df[1,0] = -2 * b * x[0] df[1,1] = b return df def rosenbrock_fdf(x, params): f = rosenbrock_f(x, params) df = rosenbrock_df(x, params) return f, df class DefaultCase(unittest.TestCase): def _getsize(self): return 2 def _run(self, solver): tmp = Numeric.array((-10., -5.), Float) solver.set(tmp) for iter in range(100): status = solver.iterate() r = solver.root() x = solver.getx() f = solver.getf() status = multiroots.test_residual(f, 1e-7) if status == 0: break else: raise ValueError, "Number of Iterations exceeded!" assert(Numeric.absolute(x[0] - 1)<1e-6) assert(Numeric.absolute(x[1] - 1)<1e-6) assert(Numeric.absolute(f[0])<1e-6) assert(Numeric.absolute(f[1])<1e-6) class FTest(DefaultCase): def setUp(self): tmp = Numeric.array((1., 10.), Float) self.sys = multiroots.gsl_multiroot_function(rosenbrock_f, tmp, self._getsize()) def test_hybrids(self): solver = multiroots.hybrids(self.sys, self._getsize()) self._run(solver) def test_dnewton(self): solver = multiroots.dnewton(self.sys, self._getsize()) self._run(solver) def test_broyden(self): solver = multiroots.broyden(self.sys, self._getsize()) self._run(solver) def test_hybrid(self): solver = multiroots.hybrid(self.sys, self._getsize()) self._run(solver) class FDFTest(DefaultCase): def setUp(self): tmp = Numeric.array((1., 10.), Float) self.sys = multiroots.gsl_multiroot_function_fdf(rosenbrock_f, rosenbrock_df, rosenbrock_fdf, tmp, self._getsize()) def test_newton(self): solver = multiroots.newton(self.sys, self._getsize()) self._run(solver) def test_gnewton(self): solver = multiroots.gnewton(self.sys, self._getsize()) self._run(solver) def test_hybridj(self): solver = multiroots.hybridj(self.sys, self._getsize()) self._run(solver) def test_hybridsj(self): solver = multiroots.hybridsj(self.sys, self._getsize()) self._run(solver) if __name__ == '__main__': unittest.main()