Set tolerance for griddata

Question

Solmaz Kahourzade 2018-6-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/404996-set-tolerance-for-griddata

评论： Solmaz Kahourzade 2018-6-11

Dear Sir/Madam,

In the Loss.mat, I have Fd and Fq matrices with 256*256 dimension as inputs and Pfer_c, Pfer_h, Pfes_c, Pfes_h, Ppm as the output of Fq and Fq. I want to obtain the value of Pfer_c, Pfer_h, Pfes_c, Pfes_h, Ppm for Fd_sat and Fq-sat (the values in LOSS_sat.mat) and I used griddata as following:

Pfer_c_sat = griddata(Fd, Fq, Pfer_c, Fd_sat, Fq_sat);                  
Pfer_h_sat = griddata(Fd, Fq, Pfer_h, Fd_sat, Fq_sat);                  
Pfes_c_sat = griddata(Fd, Fq, Pfes_c, Fd_sat, Fq_sat);                  
Pfes_h_sat = griddata(Fd, Fq, Pfes_h, Fd_sat, Fq_sat);                  
Ppm_sat = griddata(Fd, Fq, Ppm, Fd_sat, Fq_sat);

But the problem is for some values the results are “NaN” where makes the rest of my program unsolvable as they are input of a large program. Is there any way that I can estimate an integer values with the minimum error to avoid "NaN"?

I appreciate your help.

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Answer 1

KSSV 2018-6-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/404996-set-tolerance-for-griddata#answer_324076

在 MATLAB Online 中打开

griddata will give you NaN's if the interpolating data lies outside the main data. YOu may have a look on scatteredInterpolant

load Loss.mat ;
load LOSS_sat.mat ;
% Pfer_c_sat = griddata(Fd, Fq, Pfer_c, Fd_sat, Fq_sat,'cubic');     
F = scatteredInterpolant(Fd(:),Fq(:),Pfer_c(:)) ;
Pfer_c_sat = F(Fd_sat,Fq_sat) ;