Contour map from X,Y,Z Columns

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premraj
premraj 2011-8-16
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!!!

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Fangjun Jiang
Fangjun Jiang 2011-8-16
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)
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Fangjun Jiang
Fangjun Jiang 2011-8-17
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
Walter Roberson 2011-8-17
premraj, you would need to use griddata() or something similar in order to produce an array that could be used for contour()

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