Using Vlookup formulas to populate an equation

yappsta

New Member
Joined
Jan 25, 2017
Messages
4
I have got five different power equation values from a log graph for different trend lines.

Which equation I apply depends on type of room I am calculating for.

Equation structure Y = mx^b

I have got m and c in a 1 table.

x is a parameter that varies in each of the other tables I am trying to calculate from.

I have tried a couple of different formulas but no good.

=IF(Y6="","",VLOOKUP(Y6,N18:Q21,3,FALSE)*AA6^(VLOOKUP(Y6,N18:Q21,4,FALSE)))

and

=SUMPRODUCT(Y6:Y9=N17:N21,P17:P21,AA6:AA9,Q17:Q21)

Example of tables, the first of which I have many to populate.

xanswer
t.10.55
t.20.77
t.30.99
t.41.211

<tbody>
</tbody>

The second one has the values I need to use for calculations
mb
t.10.150.43
t.20.20.38
t.30.250.33
t.40.3090.296
t.50.520.206

<tbody>
</tbody>


Any help would be most welcome.

Cheers
 

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