Maths Problem

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Discussion

ecs

Original Poster:

1,222 posts

169 months

Sunday 4th September 2016
quotequote all
Guess this is the right place for this? I need to figure out an algorithm which calculates the following:

If you’ve got a min value, a max value and a number between those values, how would you calculate the number between max and min as a percentage?

e.g. if min=-100, max=100 and n=0, n as a percentage should be 50%

Min and max can be positive or negative values and I guess it ought to be possible for min to be greater than max if it doesn't make things even more complicated.

I'm a bit out of my comfort zone on this one, so does anyone here know how to solve this?

Dr Jekyll

23,820 posts

260 months

Sunday 4th September 2016
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confused

Hopefully Stephen Hawking is in the mood for a challenge.

HappyMidget

6,788 posts

114 months

Sunday 4th September 2016
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Your range is the total for the base of the percentage (max - min), and the difference of the mid value from the min is thetop half of the fraction (mid - min). You then get ((mid - min)/(max - min)) * 100. I think.

philv

3,912 posts

213 months

Sunday 4th September 2016
quotequote all
N2 > n > n1

(N-n1)/((N2 - n1)/100)

Ie same as prev post.

Edited by philv on Sunday 4th September 20:03

JungleJim

2,336 posts

211 months

Wednesday 14th September 2016
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But what about when min is greater than max?

Einion Yrth

19,575 posts

243 months

Thursday 15th September 2016
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JungleJim said:
But what about when min is greater than max?
This is Science!, most will politely ignore that particular idiocy.

V8LM

5,166 posts

208 months

Saturday 17th September 2016
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JungleJim said:
But what about when min is greater than max?
Or when min equals max?

AstonZagato

12,652 posts

209 months

Saturday 17th September 2016
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Excel has a handy function for this:
https://support.office.com/en-us/article/PERCENTRA...