Contour Plot result very different

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.

[KALYAN ACHARJYA]

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]

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]

Please remove your answers and put the content in the comment field, right below the question.

Answer 1

[jonas]

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.

[Ozzie Ozburn]

Dear Jonas, Thank you so much for your helps. I appreciate.

Regards Ozzie

Answer 2

[Ozzie Ozburn]

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

Answer 3

[Ozzie Ozburn]

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