53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
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/* DEC *PredictX(pDst, pSrc)
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*
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* ARGUMENT
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* DEC *pDst, *pSrc;
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*
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* DESCRIPTION
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* Using the previous values of A & B of the least squares line
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* Y = A + B * X, calculates the predicted value of X corresponding to
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* a given value of Y. pSrc contains Y, and the predicted X is returned
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* to pDst. The globals pGMStatA and pGMStatB should already contain
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* the values of A and B as computed and stored by LinearEstimate.
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* X = (Y - A) / B
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*
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* SIDE EFFECTS
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* None.
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*
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* RETURNS
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* pDst if successful, otherwise GM_NULL.
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*
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* POSSIBLE ERRORS
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* GM_NULLPOINTER
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* GM_OVERFLOW
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* GM_UNDERFLOW
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* GM_DIV0
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*
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* AUTHOR
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* Jared Levy
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* Copyright (C) 1987-1990 Greenleaf Software Inc. All rights reserved.
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*
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* MODIFICATIONS
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*
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*
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*/
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#include <stdio.h>
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#include "gm.h"
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#include "gmsystem.h"
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DEC *PredictX(pDst, pSrc)
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DEC *pDst, *pSrc;
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{
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DEC dTemp, *pTemp=&dTemp;
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_MacStart(GM_PREDX);
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_MacInVarD(pSrc);
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_MacOutVarD(pDst);
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(void) _SubDec80Bit(pTemp, pSrc, pGMStatA);
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pDst = DivideDecimal(pDst, pTemp, pGMStatB);
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_MacRet(pDst);
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}
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