plq_conv_on_interval — Piecewise linear quadratic (plq), two-piece convexity on interval
plqco = plq_conv_on_interval(f1,f2,x1,x3,x5)
One row of a plq function, on the interval (x1,x3].
The next row of the plq function, on the interval (x3,x5].
The open lower bound of f1.
The closed lower bound of f1, and the open upper bound of f2.
The closed upper bound of f2.
A plq function that is the convex hull of f1 and f2 on (x1,x5].
Takes two adjacent pieces of a plq function, and the intervals over which they are defined, and returns a plq function that is defined over the domain of both of the pieces, and is the convex hull of both of the pieces.
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