A method for inferring a value from known higher values and lower values. For example, if y is a function of x and we know the values for y0 and x0 and y1 and x1, we can interpolate the value for y given a value for x as approximately equal to:
y0 + [(x - x0) / (x1 - x0)] * (y1 - y0). Also called Linear Interpolation.
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