Contour Plot result very different

2018 7 16
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更新时间：2018 7 17
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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.

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KALYAN ACHARJYA
KALYAN ACHARJYA 2018-7-16
编辑：KALYAN ACHARJYA 2018-7-16
Can you elaborate more, what about x, y-axis? Are all Colm elements are independent of each other? Why you confused with more numbers of rows. Just try for 4 and 5 rows, it can be easily replicable with more rows.
jonas
jonas 2018-7-16
编辑：jonas 2018-7-16
The desired one looks like more like a density plot than a contour plot. What do you have on your z axis?
See my previous answer here on density plots. For more help, please attach a smaller segment of your data set (e.g. 10k rows)
jonas
jonas 2018-7-17
Please remove your answers and put the content in the comment field, right below the question.

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jonas
jonas 2018-7-17
编辑：jonas 2018-7-17

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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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Ozzie Ozburn
Ozzie Ozburn 2018-7-17
Dear Jonas, Thank you so much for your helps. I appreciate.
Regards Ozzie

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Ozzie Ozburn
Ozzie Ozburn 2018-7-17

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Thank you for answers. I will try your suggestion. Let me answer your questions. All columns are independent from each other. x and y are postion and z is intensity at each point. Full data are attached. Thank you
Ozzie Ozburn
Ozzie Ozburn 2018-7-17

0 个投票

Also, if possible i can use surf or mesh. 3D plots are also okey if you have suggstion.

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