2D Interpolation of data
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Hi..I was trying to perform a 2D-interpolation for 2 data files. The file AOA0_u600 contains data of nodenumber, x-coordinate, y-coordinate, z-coordinate and pressure.
The file Y-600 contains data of entity id, x-coordinate, y-coordinate and z-coordinate. Both the files contain the data for the same Y-coordinate.
Basically the idea was to interpolate the value of pressure at the values of x and z coordinate (sample points of 1st file) to the values of x and z-coordinate (query points of the 2nd file)
However,when using the interp2 function to interpolate the values, i was recieving the following error
%Error using griddedInterpolant
The grid vectors must be strictly monotonically increasing.
%Error in interp2>makegriddedinterp (line 229)
F = griddedInterpolant(varargin{:});
%Error in interp2 (line 129)
F = makegriddedinterp({X, Y}, V, method,extrap);
Could anyone please guide me as to how to resolve this issue?
clear all;
clc;
fid=fopen('AOA0_u600.txt');
a=textscan(fid, '%f %f %f %f %f', 'HeaderLines', 1);
b=cell2mat(a);
c=sortrows(b,2);
x=c(:,2);
x=x+0.275;
y=c(:,4);
z=c(:,5);
fid =fopen('Y-600.txt');
A=textscan(fid, '%f %f %f %f', 'HeaderLines', 12);
B=cell2mat(A);
C=sortrows(B,2);
X=C(:,2);
X1=X/1000;
Y=C(:,4);
Y1=Y/1000;
D=interp2(x,y,z,X1,Y1);
0 Comments
Accepted Answer
Bruno Luong
on 7 Aug 2022
Edited: Bruno Luong
on 7 Aug 2022
3 Comments
Bruno Luong
on 8 Aug 2022
Edited: Bruno Luong
on 8 Aug 2022
No it is NOT totally correct in 2D it requires Gridded data which is "A set of points that are axis-aligned and ordered".
Such grid data can be generated by meshgrid or ndgrid command with both linear grid points strickly monotonics.
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