## Interpolation

Interpolation is used to calculate a value that lies a
fractional distance between two given values. Given values A and B, the
value N is at the fractional
distance f (0 < f < 1.0) between them:

N = A + f(B-A)

For example, suppose that we want to find the value that
is one-fourth (0.25) of the way between 25 and 28:

A = 25

B = 28

f = 0.25

N = A + f(B-A)

= 25 + 0.25(28-25)

= 25 + 0.25(3)

= 25 + 0.75

= 25.75