diff src/fftw-3.3.3/kernel/extract-reim.c @ 10:37bf6b4a2645

Add FFTW3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/fftw-3.3.3/kernel/extract-reim.c	Wed Mar 20 15:35:50 2013 +0000
@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2003, 2007-11 Matteo Frigo
+ * Copyright (c) 2003, 2007-11 Massachusetts Institute of Technology
+ *
+ * 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
+ *
+ */
+
+#include "ifftw.h"
+
+/* decompose complex pointer into real and imaginary parts.
+   Flip real and imaginary if there the sign does not match
+   FFTW's idea of what the sign should be */
+
+void X(extract_reim)(int sign, R *c, R **r, R **i)
+{
+     if (sign == FFT_SIGN) {
+          *r = c + 0;
+          *i = c + 1;
+     } else {
+          *r = c + 1;
+          *i = c + 0;
+     }
+}