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/* $Id: $ */
/* Copyright (C) 1997 Sverre Hvammen Johansen,
* Department of Informatics, University of Oslo.
*
* 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; version 2.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "random.h"
/******************************************************************************
LONG REAL PROCEDURE LINEAR */
double
__rlinear (A, B, U)
__arrp A,
B;
long *U;
{
long j;
double basic,
d;
if (A->h.dim != 1 || B->h.dim != 1)
__rerror ("Linear: Multi dimensional array");
if (A->limits[0].size != B->limits[0].size)
__rerror ("Linear: Arrays of different sizes");
if (ARRELEM (A, 0) != 0.0 || ARRELEM (A, (A->limits[0].size) - 1) != 1.0)
__rerror ("Linear: Illegal value on first array");
basic = BASICU;
for (j = 0; j < A->limits[0].size; j++)
if (ARRELEM (A, j) >= basic)
break;
d = ARRELEM (A, j) - ARRELEM (A, j - 1);
if (d == 0.0)
return (ARRELEM (B, j - 1));
return (ARRELEM (B, j - 1) + (ARRELEM (B, j) - ARRELEM (B, j - 1)) *
(basic - ARRELEM (A, j - 1)) / d);
}
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