Insert "Nan" in Interpolated data from GRIDDATA that fall outside known data

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Dhirendu Somani 2021-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/763891-insert-nan-in-interpolated-data-from-griddata-that-fall-outside-known-data

编辑： Dhirendu Somani 2021-3-5

Data.txt

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Below is my code. I'm using interpoltation on the grid points using 'griddata'.

Currently the range of mesh grid which I have given is out of my sample dataset . As it is doing interpolation then why it is calculating "Vq" in query region which is outside our sample dataset. It should give NaN in that region.

~ Also if it does so then can how can we insert 'NaN' in the zone which is outside of our sample dataset ?

Thanks in Advance

clear all; clc;
F = importdata('Data.txt'); % X; Y; V;
F = F.data;
X = F(:,1); Y = F(:,2); V = F(:,3); % known values
[Xg,Yg] = meshgrid(-51:0.2:-49,10:0.1:20);
Vq = griddata(X,Y,V,Xg,Yg);