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Interpolation formula? - How to?

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antony Offline referral

Posts: 478
Joined: Jul 2013
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#1
Senior Member
Sorry for such a basic question but could you explain how to use linear interpolation formula?
marcus_avrelius Offline referral

Posts: 2,424
Joined: May 2013
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#2
Support Team
Linear interpolation between two known points.
I like aviation so I will give an example relative to aviation.

2000 feet of pressure altitude maximum take-off weight is 120.000 lbs
At sea level maximum take-off weight is 144.000 lbs

My current airport pressure altitude is 800 feet.

Y = ( ( X - X1 )( Y2 - Y1) / ( X2 - X1) ) + Y1

Where,
X1,Y1 = First co-ordinates,
X2,Y2 = Second co-ordinates,
X = Target X co-ordinate,
Y = Interpolated Y co-ordinate.

((2000 - 800) x (144.000 - 120.000) / (2000 - 0) + 120.000 = 134.400 lbs





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