# I have a table of three columns and I want to find a particular value in third column using interpolation, how can I do that if I know the values at first two columns?

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ekagra gupta on 8 Jun 2022
Answered: dpb on 8 Jun 2022
The three columns are there and I have a particular set of values (x,y) and I want to find a particular value at third column corresponding to (x,y) by interpolation. I tried interp2 but it shows "Interpolation requires at least two sample points for each grid dimension.".
Any sort of insight would be great on this one
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ekagra gupta on 8 Jun 2022
Edited: dpb on 8 Jun 2022
Ohh yeah sure I apologise.
X= [1 2 3 4]
Y= [3 6 10 12]
Z= [2 4 6 8]
So I have (X, Y) = (3.5, 4.5) And I want value of Z

dpb on 8 Jun 2022
>> SI=scatteredInterpolant(X.',Y.',Z.')
SI =
scatteredInterpolant with properties:
Points: [4×2 double]
Values: [4×1 double]
Method: 'linear'
ExtrapolationMethod: 'linear'
>> SI(3.5,4.5)
ans =
7.0000
>>
To use interp2 you would have to have all 16 Z values; SI will do its best with what it has to work with...

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