MATLAB: 1d scattered data interpolation

interpolation 1d data scattered

Hey everybody,

Matlab is becoming my arch enemy and I need some brave soldier to help me with my next battle, I have the following data:

x=[23 312 6546] y=[3 43 342]

So I can make a scattered 'graph' of points (x,y)

Now I want to linearly interpolate for example in the point, say (6,*) how can I do this? I used already 'griddedInterpolant' and other options!

Thank you very much in advance,

James

Best Answer

interp1(x, y, 6)

Related Solutions

MATLAB: Interpolation outside boundaries.

griddata() does not have the option for extrapolation beyond the data-points. You can use scatteredInterpolant for this; however, it does not have a cubic interpolation option, and the extrapolation is also linear.

P = [0 0 0;
     20 0 5;
     0 20 5 ; 
     5 5 2;
     10 10 10 ;
     20 20 10] ;
x = P(:,1) ; y = P(:,2) ; z = P(:,3) ;
ti = 0:1:30;
[XI, YI] = meshgrid(ti,ti);
model = scatteredInterpolant(x, y, z, 'linear', 'linear');
ZI = model(XI, YI);
surf(XI,YI,ZI), hold
plot3(x,y,z,'ro'), hold off
colorbar

The best way to handle such cases is to have an equation of form z = f(x, y) and then use curve-fitting to estimate the unknown parameter in f(.). Then you can use f(.) to extrapolate the values.

MATLAB: 3D interpolation with interp3

interp3 isn't meant for scattered data. You should be using scatteredInterpolant.

Best Answer

Related Solutions

MATLAB: Interpolation outside boundaries.

MATLAB: 3D interpolation with interp3

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