GetFNCApproximationLine

Calculates the straight approximation line (Using original algorithm FNC.)

int GetFNCApproximationLine(
        const double    *dataX,
        const double    *dataY,
        const int               dataNum,
        const int               selectNum,
        double          *coefficient
)

Parameters

*dataX	Coordinates X of points
*dataY	Coordinates Y of points
dataNum	Count of points
selectNum	The point number to be extructed
*coefficient	Straight line element(measurement result)

Return Value

NORMAL(0): Successful completion

Otherwise: Unsuccessful completion

Description

Calculates and outputs the coefficients of the approximation straight line based on input point sequence.

The least square method is used for the approximation.

Calculates the straight line coefficients after the number of inputs is extracted to [selectNum] with original algorithm FNC.

Output is a,b,c as for a straight line expression ax + by + c = 0. It is stored in coefficient[0], coefficient[1], and coefficient [2] respectively.

Notes

Returns ERR_PARAM when the point sequence number is less than one.

When two or more straight lines can be calculated, outputs one of them.