MATLAB: Contour Plot result very different

contourso many data

Hello, I am new about MATLAB and i have data which consist of 3 column. I want to plot a contour by using data but i was not succesfull until now. I am suspicious about data number. I am gonna add my obtained plot and needed plot. The data is 412570 x 3 matrix. I could not add data because its size is over 5 mb (can not archieved also). If someone can help i can send it as e-mail attached.

Best Answer

Here is a plot I made using surf:
data=xlsread('Kitap1.xlsx');
X=data(:,1);
Y=data(:,2);
V=data(:,3);
[Xq,Yq]=meshgrid(min(X):0.001:max(X),min(Y):0.01:max(Y));
Vq=griddata(X,Y,V,Xq,Yq);
surf(Xq,Yq,Vq,'edgecolor','interp')
view(2)
axis tight
You have to remember that you need the data on a rectangular grid to use surf. The grid is created using meshgrid and the data is then interpolated using griddata.
See attachment for results. You can play with the colormap and the resolution of the grid if you want to improve the visuals.
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