43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
/*
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* =======================================================================================
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*
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* Author: Jan Eitzinger (je), jan.eitzinger@fau.de
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* Copyright (c) 2020 RRZE, University Erlangen-Nuremberg
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*
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* This file is part of MD-Bench.
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*
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* MD-Bench is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* MD-Bench is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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* PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public License along
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* with MD-Bench. If not, see <https://www.gnu.org/licenses/>.
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* =======================================================================================
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*/
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#include <util.h>
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/* Park/Miller RNG w/out MASKING, so as to be like f90s version */
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#define IA 16807
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#define IM 2147483647
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#define AM (1.0/IM)
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#define IQ 127773
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#define IR 2836
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#define MASK 123459876
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double myrandom(int* idum)
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{
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int k= (*idum) / IQ;
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double ans;
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*idum = IA * (*idum - k * IQ) - IR * k;
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if(*idum < 0) *idum += IM;
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ans = AM * (*idum);
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return ans;
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}
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