change aspect on polar plot

I want to make a polar plot from azimuth angles and zenith angles. I wonder in polar(theta,rho) if theta is azimuth and rho is zenith? and if they must be in radian? I also wonder how I can put change the position of the origin (0) on the circule as I want the origin to start from north and increse clockwise. I appereciate your help.

Answer 1

[Hassan]

I found the answer on http://www.mathworks.com/matlabcentral/newsreader/view_thread/134222. I should use view(90,-90).

Answer 2

[Walter Roberson]

No, rho is radius. You cannot create a polar plot just from angles.

I do not see a MATLAB routine for 3D polar plots, but there might perhaps be one in the MATLAB File Exchange (FEX)

[Hassan]

thanks Walter for the reply. azimuth range is 0-360 degrees and zenith range is 0-90 degrees. in that case, rho is radius of the circle which is equivalent to zenith, and azimuth is the angle (theta) am I right?

and the theta and rho must be in radiance?

I don't need a 3D polar plot. It can be done on the 2D polar plot.

[Walter Roberson]

Since rho is not an angle, it is incorrect to think of it as being in degrees _or_ radians. theta must be in radians.

[Hassan]

I see. what about the change of the origin of angle to start from north (if we assume the current origin is in east) and increases clockwise?