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74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/* complex.c: Complex number functions
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Copyright 2003 Bjoern Butscher, Hendrik Weimer
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This file is part of libquantum
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libquantum is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published
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by the Free Software Foundation; either version 2 of the License,
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or (at your option) any later version.
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libquantum is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with libquantum; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA
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*/
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#include <math.h>
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#include "complex.h"
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#include "config.h"
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/* Return the real part of a complex number */
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float
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quantum_real(COMPLEX_FLOAT a)
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{
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float *p = (float *) &a;
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return p[0];
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}
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/* Return the imaginary part of a complex number */
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float
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quantum_imag(COMPLEX_FLOAT a)
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{
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float *p = (float *) &a;
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return p[1];
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}
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/* Return the complex conjugate of a complex number */
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COMPLEX_FLOAT
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quantum_conj(COMPLEX_FLOAT a)
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{
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float r, i;
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r = quantum_real(a);
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i = quantum_imag(a);
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return r - IMAGINARY * i;
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}
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/* Calculate the square of a complex number (i.e. the probability) */
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float
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quantum_prob(COMPLEX_FLOAT a)
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{
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return (float) (a * quantum_conj(a));
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}
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/* Calculate e^(i * phi) */
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COMPLEX_FLOAT quantum_cexp(float phi)
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{
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return cos(phi) + IMAGINARY * sin(phi);
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}
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