How can I interpolate matrix?
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0 0 0 0 31.2117
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
33.4177 0 33.0571 0 32.2147
I have 5*5 matrix.
I want to interpolate zeros using nonzero values.
How can I make this one?
2 commentaires
Stephen23
le 5 Mar 2021
Do you only want to interpolate, or do you want to extrapolate as well?
(If you only want interpolation, the left hand upper triangular section will be NaN)
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Stephen23
le 5 Mar 2021
M = [0,0,0,0,31.2117;0,0,0,0,0;0,0,0,0,0;0,0,0,0,0;33.4177,0,33.0571,0,32.2147]
[Xi,Yi] = find(M);
[Xo,Yo] = ndgrid(1:size(M,1),1:size(M,2));
A = griddata(Xi,Yi,nonzeros(M),Xo,Yo)
2 commentaires
KALYAN ACHARJYA
le 5 Mar 2021
Modifié(e) : KALYAN ACHARJYA
le 5 Mar 2021
@Stephen Cobeldick Sir, to what extent can we interpolate, is there any certain ways to measure the acceptibility of interpolated data points, because in this example available data points are very few only?
And yes you have shown in the best way, in the first section of the given data, there are no reference data points.
Thanks for your answer! This is learning for me tool. Appreciated!
Stephen23
le 6 Mar 2021
"is there any certain ways to measure the acceptibility of interpolated data points..."
No, there is no certain way to measure the acceptability. The usefulness of interpolation (and extrapolation) depends on having sufficient prior knowledge and understanding about the underlying physical process being modelled:
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