How to rotate axis of polarscatter plot?

Hello,

I have a timeseries containing the information about peaks of storms overall several years : wave direction and wave height.

I would like to show the information on a polar plot. So I am using the plot function polarscatter, but this function gives automatically 0° at East, 90° at North, 180° at West and 270° at South. I would like to have North at 0°, East at 90°, South at 180° and West at 270°. i tried to look for information in many topics but it seems nobody asked this question.

The function is very easy : polarscatter(direction,wave height)

This is what i get:

Can you help me?

thank you very much.

[madhan ravi]

create a handle for the plot function and use rotate() function ?

[Gaetan Dufour]

thank you madhan, but I think it is not only a rotation, since I want:

- 0° at North

- 90° at East

- 180° at South

- 270° at West

If I make a rotation, I will have 0° at North, 90° at West, 180° at South and 270° at East...

Answer 1

[Steven Lord]

The axes in which a polarscatter plot is located is a polaraxes. The polaraxes object has a large number of properties for controlling the theta and r behavior and appearance.

Let's create a sample polarscatter using the example from its help text.

t = 0:.05:2*pi;
h = polarscatter(t,sin(2*t).*cos(2*t),101 + 100*(sin(2*t)),cos(2*t));

Using the polarscatter handle, retrieve its parent polaraxes.

ax = ancestor(h, 'polaraxes')

Two of the properties that are displayed in the default view look like they're relevant.

ax.ThetaZeroLocation = 'top';
ax.ThetaDir = 'clockwise';

The documentation for the polaraxes function lists several of the common properties that you can set using name-value pair arguments, and the See Also section on that documentation page links to the PolarAxes properties page that lists more. [You can set the settable properties listed on the properties page using name-value pairs, even if they don't appear on the polaraxes property page.]

[Luke Barker]

I tried this on a compass but I get this error...

Unable to perform assignment because dot indexing is not supported for variables of this type.

Error in Visualize directional data with compass plot 4 (line 51)

ax.ThetaZeroLocation = 'top';

Z = compass(u,v);
colors = get(0,'DefaultAxesColorOrder')

ax = ancestor(Z, 'polaraxes');
ax.ThetaZeroLocation = 'top';
%ax.ThetaDir = 'clockwise';

set(Z,'color',colors(1,:),'linewidth',4)