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guangxi.li |
/*
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* Generate Combined Tausworthe number
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*
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* The calling syntax is:
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* x = ctg_gen(z, n)
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* [x, zf] = ctg_gen(z, n)
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*
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* Input:
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* z: initial internal state, 3 x 1 vector of unsigned 64-bit integer
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* n: length of pseudorandom numbers
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*
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* Output:
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* x: pseudorandom values, n x 1 vector of unsigned 64-bit integer
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* zf: final internal state after output n numbers
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*/
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/*
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* Copyright (C) 2014, Guangxi Liu <guangxi.liu@opencores.org>
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*
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* This source file may be used and distributed without restriction provided
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* that this copyright statement is not removed from the file and that any
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* derivative work contains the original copyright notice and the associated
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* disclaimer.
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*
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* This source file 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 by
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* the Free Software Foundation; either version 2.1 of the License,
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* or (at your option) any later version.
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*
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* This source is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this source; if not, download it from
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* http://www.opencores.org/lgpl.shtml
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*/
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#include "mex.h"
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#include "taus176.h"
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void mexFunction(int nlhs, mxArray *plhs[], int nrhs, const mxArray *prhs[])
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{
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/* Local variables */
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taus_state_t state;
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unsigned long long *z;
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double *n;
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unsigned len;
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unsigned long long *x;
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unsigned long long *zf;
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unsigned i;
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/* Check for proper number of arguments */
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if (nrhs != 2)
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mexErrMsgTxt("Two input arguments required.");
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else if (nlhs > 2)
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mexErrMsgTxt("Too many output arguments.");
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if (!mxIsUint64(prhs[0]) || (mxGetM(prhs[0]) != 3) || (mxGetN(prhs[0]) != 1))
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mexErrMsgTxt("ctg_gen requires that z be a 3 x 1 vector of unsigned 64-bit integer.");
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if (!mxIsDouble(prhs[1]) || mxIsComplex(prhs[1]) ||
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(mxGetM(prhs[1]) != 1) || (mxGetN(prhs[1]) != 1))
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mexErrMsgTxt("ctg_gen requires that n be a positive integer.");
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n = mxGetPr(prhs[1]);
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len = (unsigned)(*n);
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if (len < 1)
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mexErrMsgTxt("ctg_gen requires that n be a positive integer.");
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/* Create a vector for the return argument */
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plhs[0] = mxCreateNumericMatrix(len, 1, mxUINT64_CLASS, 0);
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if (nlhs == 2)
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plhs[1] = mxCreateNumericMatrix(3, 1, mxUINT64_CLASS, 0);
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/* Assign pointers to the various parameters */
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z = (unsigned long long*)mxGetData(prhs[0]);
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x = (unsigned long long*)mxGetData(plhs[0]);
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if (nlhs == 2)
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zf = (unsigned long long*)mxGetData(plhs[1]);
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/* Call function taus_set and assign return value */
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state.z1 = z[0];
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state.z2 = z[1];
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state.z3 = z[2];
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for (i = 0; i < len; i++)
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x[i] = taus_get(&state);
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if (nlhs == 2) {
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zf[0] = state.z1;
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zf[1] = state.z2;
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zf[2] = state.z3;
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}
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}
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