# Change colors of arrows in quiver3

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Tala 2021 年 4 月 27 日

Hi,
I used quiver3 to plot some wind measurements at three different heights. I would like to change the color for the bottom, middle and top arrows to red, green and blue respectively. I would be grateful if you can help me with that.
I only used quiver3 beacuse I knew the function. Please suggest other functions if they would a better suite for this purpose.
quiver3(x3d,y3d,z3d,cell2mat([Vx_NB_B Vx_NB_M Vx_NB_T]),cell2mat([Vy_NB_B Vy_NB_M Vy_NB_T]),zeros(1,90))
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Scott MacKenzie 2021 年 4 月 27 日
h1 = quiver3( . . . ); % code for top arrows
h1.Color = 'r'; % red arrows
hold on;
axis([0 80 0 200 0 9]);
h2 = quiver3( . . . ); % code for middle arrows
h2.Color = 'g'; % green arrows
h3 = quiver3( . . . ); % code for bottom arrows
h3.Color = 'b'; % blue arrows

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### 採用された回答

Scott MacKenzie 2021 年 4 月 30 日

Faraz's primary concern is controlling the color in each stratum of the plot. I think this is close to the answer sought:
n = 500;
bottomStratum = [10 20];
middleStratum = [40 60];
topStratum = [80 90];
x = randi(100, 1, n);
y = randi(100, 1, n);
z1 = randi(bottomStratum, 1, n);
z2 = randi(middleStratum, 1, n);
z3 = randi(topStratum, 1, n);
u = x .* rand(1, n);
v = y .* rand(1, n);
w1 = z1 .* rand(1, n);
w2 = z2 .* rand(1, n);
w3 = z3 .* rand(1, n);
% bottom arrows
quiver3(x, y, z1, u, v, w1, 'color', 'r');
hold on;
axis([0 100 0 100 0 100]);
% middle arrows
quiver3(x, y, z2, u, v, w2, 'color', 'g');
% top arrows
quiver3(x, y, z3, u, v, w3, 'color', 'b');

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### その他の回答 (1 件)

Pratheek Punchathody 2021 年 4 月 30 日
You can use the following code as reference for changing the color of the arrows using the "Color property in quiver3()" function.
X = x(5:10,20:25,6:10);
Y = y(5:10,20:25,6:10);
Z = z(5:10,20:25,6:10);
U = u(5:10,20:25,6:10);
V = v(5:10,20:25,6:10);
W = w(5:10,20:25,6:10);
quiver3(X,Y,Z,U,V,W,'color','r'); %'color' Name-Value pair will help to change the color of the arrow
axis equal
Below shows the output obtained from the above code.
Hope this helps..

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