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- /* cdf/cauchy.c
- *
- * Copyright (C) 2003, 2007 Brian Gough
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 3 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- #include "gsl__config.h"
- #include <math.h>
- #include "gsl_math.h"
- #include "gsl_cdf.h"
- double
- gsl_cdf_cauchy_P (const double x, const double a)
- {
- double P;
- double u = x / a;
- if (u > -1)
- {
- P = 0.5 + atan (u) / M_PI;
- }
- else
- {
- P = atan(-1/u) / M_PI;
- }
-
- return P;
- }
- double
- gsl_cdf_cauchy_Q (const double x, const double a)
- {
- double Q;
- double u = x / a;
-
- if (u < 1)
- {
- Q = 0.5 - atan (u) / M_PI;
- }
- else
- {
- Q = atan(1/u) / M_PI;
- }
- return Q;
- }
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