Scatter plot with extra features

Question

BeeTiaw 2019-3-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/449957-scatter-plot-with-extra-features

评论： BeeTiaw 2019-3-19

Hi expert,

I want to create a scatter plot where each individual points have one extra information which I also want to plot, i.e. their azimuth.

The data is shown below

data=[
% Temp   Pres  Azim
  78    45
  44    0
  66    120
  27    100
  52    110];

The azimuth listed in the third column of the data is measured from the top of each data points (or circle) clockwise from [0,360deg].

How do I do this? The following plot has been generated manually by adding the blue line that shows the azimuth of each points.

Thank you!

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Answer 1

Guillaume 2019-3-13

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在 MATLAB Online 中打开

halflength = 2;
scatter(data(:, 1), data(:, 2), 'MarkerEdgeColor', 'b', 'MarkerFaceColor', 'r')
for row = 1:size(data, 1)
    line(data(row, 1) + sind(data(row, 3)) * [-halflength, halflength], ...
         data(row, 2) + cosd(data(row, 3)) * [-halflength, halflength], ...
         'Color', 'b');
end

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Guillaume 2019-3-14

Indeed, make sure the aspect ratio is is the same on both axis.

BeeTiaw 2019-3-19

Thanks @Akira Agata!

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Answer 2

Akira Agata 2019-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/449957-scatter-plot-with-extra-features#answer_365257

在 MATLAB Online 中打开

How about using quiver function? Here is an example.

data = [
  % Temp   Pres  Azim
  41    78    45
  66    44    0
  170    66    120
  136    27    100
  137    52    110];
u = 10*sind(data(:,3));
v = 10*cosd(data(:,3));
figure
scatter(data(:,1),data(:,2))
hold on
quiver(data(:,1)-u/2,data(:,2)-v/2,u,v,'AutoScale','off')
daspect([1 1 1])
xlabel('Temp','FontSize',12)
ylabel('Pres','FontSize',12)
box on
grid on