Hi, I'm facing problem in plotting a 3D graph in Matlab. I'm not using the meshgrid or similar function because the range of x and y need to be specified specially(Please refer attachment for details).
Thanks for any reply from u..

Have you tried the function plot3?

ya, I had used plot3 in the same program. plot3 is used for 3D line. But what I need is a 3D surface graph specified in a special range of x and y.
I need to draw a 3D grpah of the exact solution, then use plot3 to show the numerical solution( few points) on the 3D graph.

can't you use the surf function and then modify the axes properties with the function set?

Can you give me some examples? My problem involved the polar coordinate. suppose it is used polar function in Maple,but in Matlab, I can't understand the polar funtion, so I don't know how to apply the function into my project.

Did anyone know about cart2pol function in Matlab?
[THETA,RHO] = cart2pol(X,Y)
It means change the cartesian coordinates x and y to polar coordinates. Before applying this method, I think there should be a list of x and y coordinate in the system in order to change it into polar coordinate.
Now, the problem is, if I use meshgrid, the domian is incorrect, it included the coordinate which I do not want (and excluded the coordinate which I want).
Can anyone tell me or teach me how to fix the problem by writting a command code, to specify the range of x and y correctly? Or should I use pol2cart function? change the polar coordinate to cartesian coordinate, then use those cartesian coordinate to plot my graph.
(Please refer to the attachment for a clearer description)

Dear anyone, I have been using hard-code to fix my problem. Thanks for any help from you.
Thanks.

Hi,

I have a similar problem as you posted.
Could you tell me how to solve it?
Thanks

Uwen