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 个评论
Stephen23
2021-3-5
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)
HyoJae Lee
2021-3-5
采纳的回答
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 个评论
KALYAN ACHARJYA
2021-3-5
编辑：KALYAN ACHARJYA
2021-3-5
@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
2021-3-6
"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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