Using a for loop to graph values using different colors

Question

Mariana Lugo 2020-4-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/517625-using-a-for-loop-to-graph-values-using-different-colors

评论： Stephen23 2020-4-14

I'm using some distances and I want to plot them. On my plot they should have a different color depending on how far away the are. Right now when I run my code, they're all being displayed with the same color. How can I make my distances different colors depending on their distance?

clear all
close all
data = [3 24 30 26 22 14 15 7 5 9];
t = (1:length(data));
for i = 1:length(data);
 
  if data(data <= 30 & data > 20)
    scatter(t,data,'.g');
    hold on;
  elseif data(data <= 20 & data > 10)
      scatter(t,data,'.y');
      hold on;
  elseif data(data <= 10 & data >= 0)
      scatter(t,data,'.r');
      hold on;
          
  end
xlabel('time (seconds)')
xlim([0 13])
ylabel('distance(meters)')
ylim([0 35])
title('Distance of Vehicle Over Time')
end

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Answer 1

Ameer Hamza 2020-4-13

1
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https://ww2.mathworks.cn/matlabcentral/answers/517625-using-a-for-loop-to-graph-values-using-different-colors#answer_425843

编辑：Ameer Hamza 2020-4-13

在 MATLAB Online 中打开

There were issues with the if conditions. Check the corrected code. Also, note that you were plotting to scatter plot with all points.

clear all
close all
data = [3 24 30 26 22 14 15 7 5 9];
t = (1:length(data));
for i = 1:length(data)
    
    if data(data(i) <= 30 & data(i) > 20)
        scatter(t(i),data(i),'+b', 'Linewidth', 2);
        hold on;
    elseif data(data(i) <= 20 & data(i) > 10)
        scatter(t(i),data(i),'+m', 'Linewidth', 2);
        hold on;
    elseif data(data(i) <= 10 & data(i) >= 0)
        scatter(t(i),data(i),'+r', 'Linewidth', 2);
        hold on;
        
    end
    xlabel('time (seconds)')
    xlim([0 13])
    ylabel('distance(meters)')
    ylim([0 35])
    title('Distance of Vehicle Over Time')
end

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Answer 2

Turlough Hughes 2020-4-13

1
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https://ww2.mathworks.cn/matlabcentral/answers/517625-using-a-for-loop-to-graph-values-using-different-colors#answer_425848

编辑：Turlough Hughes 2020-4-13

在 MATLAB Online 中打开

If you want to use scatter so that the color depends on distance, this is how you do it:

% Data
clear all
close all
data = [3 24 30 26 22 14 15 7 5 9];
t = (1:length(data));
scatter(t,data,[],data,'filled') %      < modified code
xlabel('time (seconds)')
xlim([0 13])
ylabel('distance(meters)')
ylim([0 35])
title('Distance of Vehicle Over Time')