updated libquantum 0.1.0 source files

complex.c

@@ -0,0 +1,73 @@
+/* complex.c: Complex number functions
+
+   Copyright 2003 Bjoern Butscher, Hendrik Weimer
+
+   This file is part of libquantum
+
+   libquantum 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.
+
+   libquantum 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 libquantum; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+   USA
+
+*/
+
+#include <math.h>
+
+#include "complex.h"
+#include "config.h"
+
+/* Return the real part of a complex number */
+
+float
+quantum_real(COMPLEX_FLOAT a)
+{
+  float *p = (float *) &a;
+  return p[0];
+}
+
+/* Return the imaginary part of a complex number */
+
+float
+quantum_imag(COMPLEX_FLOAT a)
+{
+  float *p = (float *) &a;
+  return p[1];
+}
+
+/* Return the complex conjugate of a complex number */
+
+COMPLEX_FLOAT
+quantum_conj(COMPLEX_FLOAT a)
+{
+  float r, i;
+
+  r = quantum_real(a);
+  i = quantum_imag(a);
+
+  return r - IMAGINARY * i;
+}
+
+/* Calculate the square of a complex number (i.e. the probability) */
+
+float 
+quantum_prob(COMPLEX_FLOAT a)
+{
+  return (float) (a * quantum_conj(a));
+}
+
+/* Calculate e^(i * phi) */
+
+COMPLEX_FLOAT quantum_cexp(float phi)
+{
+  return cos(phi) + IMAGINARY * sin(phi);
+}