Wind rose with no degrees for direction

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Madison
Madison 2025-2-26
编辑： Torsten 2025-2-26
I am trying to plot a wind rose but for direction I only have N, NE, NNE etc rather than degrees. Is there a code or script for this?
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Torsten
Torsten 2025-2-26
编辑：Torsten 2025-2-26
Ran in:
Usually you start with E = (1,0) as 0°, goto N = (0,1) as 90°, goto W = (-1,0) as 180°, goto S = (0,-1) as 270°.
The coordinates can then be obtained by the cosd and sind functions:
[cosd(0),sind(0)]
ans = 1×2
1 0
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[cosd(90),sind(90)]
ans = 1×2
0 1
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[cosd(180),sind(180)]
ans = 1×2
-1 0
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[cosd(270),sind(270)]
ans = 1×2
0 -1
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But you are right: I just found that the relation between angle and direction seems to be different for wind roses:
https://en.wikipedia.org/wiki/Wind_rose

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回答（1 个）

Steven Lord
Steven Lord 2025-2-26
Ran in:
Let's make some random direction data.
directions = ["N", "NE", "E", "SE", "S", "SW", "W", "NW"];
n = numel(directions);
angles = 0:45:315;
randomDirections = directions(randi(n, 1, 10));
Now we can convert those strings into the corresponding angles.
[~, indices] = ismember(randomDirections, directions);
correspondingAngles = angles(indices);
And now we can show the results as a table so you can check.
results = table(randomDirections.', correspondingAngles.', VariableNames = ["dir", "angle"])
results = 10x2 table
dir angle ____ _____ "N" 0 "N" 0 "NE" 45 "W" 270 "N" 0 "S" 180 "S" 180 "NW" 315 "NE" 45 "E" 90

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