To crate a 2D lookup table with interpolation for matrix data and to crate a function of (x,y) (inputs) give the output from the matrix
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I have data matrix, for an example:
A=[0,1,2,3,4,5; 2,3,5,6,6;3 3 5 0 9]; % A data matrix.
x=-100:5:100; % x-axis
y=-100:5:100; % y-axis
i want to for any (x,y) value (in the range -100 to 100) to obtain the matrix vaule, so two things need to do covert the index A(i,j) to A(x,y) and to inerpolated between breaking point, for an eaxmple A(1,2.5) .
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KSSV
il 1 Ago 2019
Read about interp2.
n = 20 ;
Z = peaks(n) ;
[X,Y] = meshgrid(1:n,1:n) ;
[Xi,Yi] = meshgrid(1:0.1:n,1:0.1:n) ;
Zi = interp2(X,Y,Z,Xi,Yi) ;
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John D'Errico
il 4 Ago 2019
That is EXACTLY what interp2 will do. It does not just sample the data. It interpolates the data array at any list of points. And this is exactly what you asked for.
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