Contour map from X,Y,Z Columns

Hi , I want to create a contour map with circular shape(radius 150) from three columns of data .Please help me to solve this issue.

X             Y             Z

   ---------------------------

0      0       8687

45      45      7951

45         -45      9161

-45       -45    8357

-45       45      7969

0          -70      8748

70          0      8522

0           70      8246    
-70          0      8588

Thanks in advance!!!

Answer 1

[Fangjun Jiang]

You need to re-organize your data. Maybe like this:

data=[...
0      0       8687    
70          0      8522
45      45      7951
0           70      8246    
-45       45      7969
-70          0      8588
-45       -45    8357
0          -70      8748
45         -45      9161
70          0      8522];

x=data(:,1);
y=data(:,2);
z=data(:,3);

stem3(x,y,z);hold on;
plot3(x,y,z)

[premraj]

Hi Jiang, I appreciate ur response!!!

I have few concerns, is there any way to create Contour plot with this data?I get an error "Z must be size 2x2 or greater" when tried the

contour(x,y,z) command on MatLab.

[Fangjun Jiang]

That is right. Your data is not fit for the contour() function. You can take a look at some examples of contour() usage to figure out what is the required data. You have so little data. I could only guess what you are expecting. The figure generated above is the only meaningful visualization with the amount data you have.

[Walter Roberson]

premraj, you would need to use griddata() or something similar in order to produce an array that could be used for contour()