Perform the bisection between two points.
[a,b] = NL_F_Bisection(x1,y1,x2,y2)
x-coordinate of the first point.
y-coordinate of the first point.
x-coordinate of the second point.
y-coordinate of the second point.
Slope.
y-intercept.
NL_F_Bisection computes the parameters y=a.x+b of the bisection of the two points (x1,y1) and (x2,y2). If y1=y2, then a=[] and b=[]. The bisection is defined by y=y1.