How to contour plot from columns of data?

Hi. I have three columns of data. The first two columns are the x and y coordinates while the third one is the isoline column. Can anyone help me how to make a single contour plot in Matlab. I have attached the file here. Please help. Thanks.

Answer 1

[Simon Chan]

Use function scatter may be more suitable for you:

filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/1305315/contour%20plot%20data.txt';
opts = detectImportOptions(filename);
opts.DataLines = [9 Inf];
opts.VariableNames = {'x','y','IsoLevel'};
rawdata = readtable(filename,opts);
s=scatter(rawdata.x,rawdata.y,[],rawdata.IsoLevel);

[Bacha Munir]

Yes. But could you line plot it?. I need a line plot not circle plot。

[Bacha Munir]

please help me how can I draw a line plot?. Thank you.

[Simon Chan]

You may try to use the dot as the marker and adjust the LineWidth property in order for the plot to look like a line.

s=scatter(rawdata.x,rawdata.y,[],rawdata.IsoLevel,'.','LineWidth',1);

[Bacha Munir]

Okay. Thank you so much. God bless you.