Interpolation of 3 dimensional values from a excel file

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kyungdoo lee
kyungdoo lee on 19 Oct 2021
Commented: kyungdoo lee on 20 Oct 2021
how should i interpolate them so that i can give any value of x and y in between the range to get ultimate value of z.
i have attached a file of values for more clarity.

Accepted Answer

KSSV
KSSV on 19 Oct 2021
Read about interp2.
T = readtable('https://in.mathworks.com/matlabcentral/answers/uploaded_files/771628/excel%20table.xlsx') ;
T = table2array(T) ;
x = T(1,2:end);
y = T(2:end,1);
Z = T(2:end,2:end); % use fillmissing to fill NaNs
[X,Y] = meshgrid(x,y) ;
figure(1)
pcolor(X,Y,Z);
% do interpolation
m = 100;
xi = linspace(min(x),max(x),m) ;
yi = linspace(min(y),max(y),m);
[Xi,Yi] = meshgrid(xi,yi);
Zi = interp2(X,Y,Z,Xi,Yi);
pcolor(Xi,Yi,Zi)
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