How to add colourmap to 2D vectorplot created by using quiver

Question

HARIKRISHNA B YADULADODDI 2021-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/724248-how-to-add-colourmap-to-2d-vectorplot-created-by-using-quiver

评论： HARIKRISHNA B YADULADODDI 2021-4-7

Hello all,

I have created 2D vector plot by using quiver i.e( quiver (x,y,u,v)), i am getting vecrot plot of 20*9 ( totally 180 vectors) . i have to add colours to this vector plot where colour of the plot represents the magnitude of vector at that index along with vectors in the plot with colour bar the end. kindly help me in this and any proper sources for learning the matlab as i am a beginner.

Thank in advance

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Answer 1

Shubham Rawat 2021-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/724248-how-to-add-colourmap-to-2d-vectorplot-created-by-using-quiver#answer_605668

Hi HariKrishna,

You may use this file to solve your problem:

quiverwcolorbar - File Exchange - MATLAB Central (mathworks.com)

You can download this file and run into your MATLAB. This contains a function quiverwcolorbar, which can colour the vector plot according to their vector magnitude.

Hope this helps!

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HARIKRISHNA B YADULADODDI 2021-2-3

编辑：HARIKRISHNA B YADULADODDI 2021-4-7

Thank you for your reply to my question. I will try your suggestion.

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Answer 2

darova 2021-2-4

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https://ww2.mathworks.cn/matlabcentral/answers/724248-how-to-add-colourmap-to-2d-vectorplot-created-by-using-quiver#answer_614782

在 MATLAB Online 中打开

Try this example

clc,clear
[x,y,z] = peaks(20);        % generate data
[u,v] = gradient(z,1);      % create u and v vectors
h = quiver(x,y,u,v);        % display standard quiver
    % extract each arrow separately
c = get(h,'children');
x1 = get(c(2),'xdata');     % arrow body
y1 = get(c(2),'ydata');
x2 = get(c(3),'xdata');     % arrow head
y2 = get(c(3),'ydata');
cmap = jet(200);            % generate 200 colors
    % color arrows according to Z values
F = scatteredInterpolant(x,y,z);
zmin = min(z(:));
k = max(z(:)) - min(z(:));
for i = 1:3:length(x1);
    ii = (F(x1(i),y1(i))-zmin)/k*199;   % scale Z value (0-199)
    ii = round(ii)+1;                   % index of color
    line(x1(i:i+2),y1(i:i+2),'color',cmap(ii))  % body
    line(x2(i:i+2),y2(i:i+2),'color',cmap(ii))  % head
end