Interpolation from a table

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Domenico Sorvillo
Domenico Sorvillo 2022-10-30
回答： Star Strider 2022-10-30
Hello, I have put in my script a table like this one to find the value K0 :
i have both value e/b, for select column, and y/b for the rows.
As you can immagine i need a double interpolation to find my value of K0. If we put e/b = 0.23 (red) and y/b = 0.60 (blue) how can i select the values insite the intersection between the red columns and the blue rows for the final interpolation?
Hope is all clear
Ty for your answers

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回答（1 个）

Star Strider
Star Strider 2022-10-30
Ran in:
The interp2 function is one option —
eb = [0 0.25];
yb = [0.5; 0.75];
K0 = [1.0009 1.3767; 0.9948 1.5583];
Check = [NaN eb; yb K0]
Check = 3×3
NaN 0 0.2500 0.5000 1.0009 1.3767 0.7500 0.9948 1.5583
ebq = 0.1; % 'e/b' Value To Interpolate
ybq = 0.6; % 'y/b' Value To Interpolate
K0q = interp2(yb, eb, K0, ybq, ebq) % Interpolated 'K0' Value
K0q = 1.1788
figure
surfc(yb, eb, K0, 'FaceAlpha',0.9)
hold on
stem3(ybq, ebq, K0q, 'r', 'filled')
hold off
colormap(turbo)
grid on
xlabel('y/b')
ylabel('e/b')
zlabel('K0 (\theta = 0.20)')
.

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