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#define jennrich_N 10
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#define jennrich_P 2
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#define jennrich_NTRIES 1
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static double jennrich_x0[jennrich_P] = { 0.3, 0.4 };
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static double jennrich_epsrel = 1.0e-8;
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static void
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jennrich_checksol(const double x[], const double sumsq,
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const double epsrel, const char *sname,
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const char *pname)
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{
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size_t i;
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const double sumsq_exact = 1.243621823556148e+02;
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const double jennrich_x[jennrich_P] = { 2.578252139935855e-01,
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2.578252133471426e-01 };
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gsl_test_rel(sumsq, sumsq_exact, epsrel, "%s/%s sumsq",
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sname, pname);
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for (i = 0; i < jennrich_P; ++i)
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{
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gsl_test_rel(x[i], jennrich_x[i], epsrel, "%s/%s i=%zu",
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sname, pname, i);
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}
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}
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static int
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jennrich_f (const gsl_vector * x, void *params, gsl_vector * f)
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{
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double x1 = gsl_vector_get(x, 0);
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double x2 = gsl_vector_get(x, 1);
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size_t i;
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for (i = 0; i < jennrich_N; ++i)
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{
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double ip1 = i + 1.0;
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double fi = 2.0*(i + 2.0) - (exp(x1*ip1) + exp(x2*ip1));
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gsl_vector_set(f, i, fi);
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}
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return GSL_SUCCESS;
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}
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static int
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jennrich_df (const gsl_vector * x, void *params, gsl_matrix * J)
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{
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double x1 = gsl_vector_get(x, 0);
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double x2 = gsl_vector_get(x, 1);
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size_t i;
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for (i = 0; i < jennrich_N; ++i)
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{
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double ip1 = i + 1.0;
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gsl_matrix_set(J, i, 0, -ip1*exp(ip1*x1));
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gsl_matrix_set(J, i, 1, -ip1*exp(ip1*x2));
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}
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return GSL_SUCCESS;
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}
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static gsl_multifit_function_fdf jennrich_func =
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{
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&jennrich_f,
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&jennrich_df,
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NULL,
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jennrich_N,
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jennrich_P,
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NULL,
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0,
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0
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};
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static test_fdf_problem jennrich_problem =
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{
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"jennrich",
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jennrich_x0,
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NULL,
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&jennrich_epsrel,
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jennrich_NTRIES,
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&jennrich_checksol,
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&jennrich_func
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};
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