[Scilab-users] Problem graypolarplot

[SCHULZ Wolfgang]

Hello, 
I have problems using the options of graypolarplot
The following basic function is working:
graypolarplot(theta,rho,Gain_plot')

But if I want to use some options I get an error message. The following examples produce error messages:
graypolarplot(theta,rho,Gain_plot',strf="030",rect=[-20,-20,20,20])
graypolarplot(theta,rho,Gain_plot',"020",[-500,-500,500,500])
graypolarplot(theta,rho,Gain_plot',"030")

How to use those examples?
Another question would be - is it possible to have 0° in the direction of the positive y-axis (North) and maybe the direction of the angle clockwise?

Thanks for your help
Wolfgang