Two inputs in sequence (XiYi) represent a support point pair. The first input XiYi corresponds to X1, the nextY1, the nextX2 etc.

For any X input value falling between these support points, the corresponding Y output is linearly interpolated.

For X < X 1 is Y = Y 1

For X > X m is Y = Y m

If the value at the X input exceeds the last support pointXm , the QXHI output becomes "1".

If the value at the X input is lower than the value of the first support point X1 , the QXLO output becomes "1".

The following algorithm applies to the Y coordinate:

for X i ≤ X ≤ X i+1 and i = 1 ... (m-1)

Assuming: X 1 ≤ X 2 ≤ ... ≤ X i ≤ X i+1 ≤ ... ≤ X m-1 ≤ X m

The X values must be in ascending order.

Two Xvalues in a row may be the same. This means a discontinuous curve is possible.

There are exceptions:

Y = 0.5 x (Y i + Y i+1)

for

X i = X = X i+1 and i = 1 ... (m-1)