1 files changed, 60 insertions, 0 deletions
diff --git a/gsl-1.9/fft/gsl_fft.h b/gsl-1.9/fft/gsl_fft.h
new file mode 100644
index 0000000..d98971f
--- /dev/null
+++ b/gsl-1.9/fft/gsl_fft.h
@@ -0,0 +1,60 @@
+/* fft/gsl_fft.h
+ * 
+ * Copyright (C) 1996, 1997, 1998, 1999, 2000 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 2 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.
+ */
+
+#ifndef __GSL_FFT_H__
+#define __GSL_FFT_H__
+
+#include <gsl/gsl_complex.h>
+
+#undef __BEGIN_DECLS
+#undef __END_DECLS
+#ifdef __cplusplus
+# define __BEGIN_DECLS extern "C" {
+# define __END_DECLS }
+#else
+# define __BEGIN_DECLS /* empty */
+# define __END_DECLS /* empty */
+#endif
+
+__BEGIN_DECLS
+
+#ifndef GSL_DISABLE_DEPRECATED
+typedef enum
+  {
+    forward = -1, backward = +1,
+    gsl_fft_forward = -1, gsl_fft_backward = +1      
+  }
+gsl_fft_direction;
+#else
+typedef enum
+  {
+    gsl_fft_forward = -1, gsl_fft_backward = +1   
+  }
+gsl_fft_direction;
+#endif
+
+/* this gives the sign in the formula
+
+   h(f) = \sum x(t) exp(+/- 2 pi i f t) 
+       
+   where - is the forward transform direction and + the inverse direction */
+
+__END_DECLS
+
+#endif /* __GSL_FFT_H__ */