Legacy Document

Inside Macintosh: QuickDraw GX Environment and Utilities /

Chapter 8 - QuickDraw GX Mathematics / QuickDraw GX Mathematics Reference

Mathematical Functions / Linear and Quadratic Roots

LinearRoot

You can use the LinearRoot function to obtain the root of a linear equation.

long LinearRoot(Fixed first, Fixed last, fract t[]);

first

The first coefficient.

last

The last coefficient.

t

An array of fract numbers. On return, it contains the roots of the equation.

function result

The number of roots of the linear equation. This value may be 0 or 1
(or -1 if all values of t are roots).

DESCRIPTION

The LinearRoot function computes any t between 0 and 1 in which a(1 - t) + bt = 0. The coefficient a is the parameter first. The coefficient b is the parameter last. The function returns the number of roots between 0 and 1.

Any root is returned in the t array, which only needs to hold one value. If both a and b are zero, the function returns the number -1, indicating that a(1 - t) + bt = 0 for all t.