INVERSELERP

How far a value is from one to another, as a part of the way: the opposite of LERP.

Syntax

INVERSELERP(a,b,value)

Argument	Meaning
a, b	Two numbers, or two positions.
value	A number between them (or beyond), or a position.

Result

A number: 0 at a, 1 at b, 0.5 half way; less than 0 or more than 1 beyond them.

Examples

In the example drawing:

Expression	Gives
`INVERSELERP(0,10,4)`	`0.4`
`INVERSELERP(1/4,3/4,1/2)`	`1/2`
`INVERSELERP(1',2',1'3")`	`1/4`
`INVERSELERP(P0,P1,[125,40])`	`0.25`

Notes

Fractions, and feet and inches, give a fraction, exactly. For positions, it is the part of the way from a to b of the point on the line through them nearest the value. a and b must differ.