[Scilab-users] cannot get polarplot to graph a decent windrose

[Samuel Gougeon]

Hello Heinz,

Le 24/03/2019 à 16:18, Heinz Nabielek a écrit :
> First polarplot problem was to put 0 on top and 90° to the right. This problem was solved by Federico using gca().rotation_angles = [180 0]
>
> x = (0:360)/180*%pi;
> y = 0.5*(1 + cos(x));
> polarplot(x, y)
> gca().rotation_angles = [180 0]

Yes, this is the trick. It work since Scilab 6.0.2. Before, labels were 
shifted when rotating the axes. This was recently corrected in order to 
use this trick. It is now being documented 
<http://bugzilla.scilab.org/show_bug.cgi?id=5693>.

> ______
> Second problem:
>> plot several curves in polar mode is to use matrices as input, as for the plot() and plot2d() functions
> does not work....
> x = (0:360)'/180*%pi;
> z=[(0.5*(1 + cos(x)))  (0.5+(1 + cos(x)))];
> polarplot(x,z);
>
> produces the ERROR MESSAGE
>> at line    18 of function polarplot ( /Applications/scilab-6.0.2.app/Contents/MacOS/share/scilab/modules/graphics/macros/polarplot.sci line 31 )
>> Inconsistent row/column dimensions.

To be reported. This occurs since the first ages of Scilab. This clearly 
deserves to be fixed.
The behavior should be the plot() and plot2d() one.

As a workaround before Scilab 6.1.0, the following code may be used:

x = (0:360)'/180*%pi;
z = [(0.5*(1 + cos(x)))  (0.5+(1 + cos(x)))];
polarplot(x*ones(z(1,:)), z)


Samuel

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