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 2022-6-8

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回答： dpb 2022-6-8

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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dpb 2022-6-8

"Any sort of insight would be great..."

Yeah, like give us a sample dataset to work with and show us what you're wanting for output...

ekagra gupta 2022-6-8

编辑：dpb 2022-6-8

在 MATLAB Online 中打开

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

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Answer 1

dpb 2022-6-8

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https://ww2.mathworks.cn/matlabcentral/answers/1736645-i-have-a-table-of-three-columns-and-i-want-to-find-a-particular-value-in-third-column-using-interpol#answer_981880

在 MATLAB Online 中打开

>> 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
>> 