MATLAB: Filtering a wind direction vector by a wind magnitude vector

filtering vectorswind direction

I have a set of time series data of wind magnitude and direction.

I want plot the wind direction over a certain wind magnitude (5 m/s) on a rose plot.

How can I create a new vector that gives only the wind direction when then magnitude is greater than 5 m/s?

Logically something like…

if wndSpeed < 5.0
  wndDirection == NaN
end

Open to any solutions!

Thanks

Best Answer

Use logical addressing...

ix=(wndSpeed>=5.0);
data=[wndSpeed(ix) wndDirection(ix)];  % keep desired

Use time vector same indices to match...

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MATLAB: Wind vector arrows color coding

Compass produces individual line object, not tied to a colormap, so you'll have to do the color-matching yourself:

wdir = [45 90 90];
knots = [6 6 8 ];
temp= [10 5 -2]; 
rdir = wdir * pi/180;
[x,y] = pol2cart(rdir,knots);
h = compass(x,y);
tcol = interpcolor(temp, jet(64), [-5 10]);
set(h, {'color'}, num2cell(tcol,2));
colormap(jet);
set(gca, 'clim', [-5 10]);
colorbar;

Find interpcolor here. Note that the colormap and colorbar in the above figure are for reference only; they don't actually link to the colors of the arrows.

(Also, you really shouldn't accept an answer if it doesn't actually answer your question).

MATLAB: Three step wind pattern

Use three step inputs and add them together
Use FromWorkspace block, specify time and value pairs
Use Signal Builder block

Best Answer

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MATLAB: Wind vector arrows color coding

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