Double Interpolation from a table
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Karthik Agnihotri
on 22 Oct 2020
Commented: Karthik Agnihotri
on 22 Oct 2020
I'm trying to interpolate off the table attached.
E = xlsread('Exhaust_Cp.xlsx')
m_dot_exhaust =[0.0168758667758187 0.0168286355030812 0.0168280643029830 0.0163466175171450]
T_avg_rankine =[871.065000000000 974.025000000000 1115.12700000000 1304.31600000000]
[x,y]=meshgrid(E(2:end,1),E(1,2:end))
z=[E(2:end,2:end)]
Vq=interp2(x,y,z,m_dot_exhaust(1),T_avg_rankine(1))
But I keep getting this error. Can anyone tell me how to resolve this?
Error using griddedInterpolant
The sample points arrays must have the same size as the sample values array.
4 Comments
KSSV
on 22 Oct 2020
It is beacuse, your points are lying outside the given grid....it comes to extrapolation and the result cannot be trusted.
Accepted Answer
KSSV
on 22 Oct 2020
Vq=interp2(x,y,z',m_dot_exhaust(1),T_avg_rankine(1)) ;
2 Comments
KSSV
on 22 Oct 2020
m_dot_exhaust =[0.0168758667758187 0.0168286355030812 0.0168280643029830 0.0163466175171450];
T_avg_rankine =[871.065000000000 974.025000000000 1115.12700000000 1304.31600000000];
[x,y]=meshgrid(E(2:end,1),E(1,2:end));
z=[E(2:end,2:end)];
Vq=interp2(X,Y,z',T_avg_rankine,m_dot_exhaust*1000)
From your given points T_avg_rankine is x-axis and m_dot_exhaust is y-axis. Check your units......if I multiply this by 1000, the points very much lie in the grid.
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