/* DEC	*PredictY(pDst,	pSrc)
 *
 * ARGUMENT
 *	DEC	*pDst, *pSrc;
 *
 * DESCRIPTION
 *	Using the previous values of A & B of the least	squares	line
 *   Y = A + B * X, calculates the predicted value of Y	corresponding to
 *   a given value of X.  pSrc contains	X, and the predicted Y is returned
 *   to	pDst.  The globals pGMStatA and	pGMStatB should	already	contain
 *   the values	of A and B as computed and stored by LinearEstimate.
 *
 * SIDE	EFFECTS
 *	None.
 *
 * RETURNS
 *	pDst if	successful, otherwise GM_NULL.
 *
 * POSSIBLE ERRORS
 *	GM_NULLPOINTER
 *	GM_OVERFLOW
 *	GM_UNDERFLOW
 *
 * AUTHOR
 *  Jared Levy
 *   Copyright (C) 1987-1990 Greenleaf Software	Inc.  All rights reserved.
 *
 * MODIFICATIONS
 *
 *
 */

#include <stdio.h>
#include "gm.h"
#include "gmsystem.h"

DEC	*PredictY(pDst,	pSrc)
DEC	*pDst, *pSrc;
{
	DEC	dTemp, *pTemp=&dTemp;
	_MacStart(GM_PREDY);
	_MacInVarD(pSrc);
	_MacOutVarD(pDst);

	if (!MultiplyDecimal(pTemp, pSrc, pGMStatB))
		_MacRet(GM_NULL);

	pDst = AddDecimal(pDst,	pTemp, pGMStatA);

	_MacRet(pDst);
}