how to make 2D graph with 3 data set

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sensation 2017-6-23

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https://ww2.mathworks.cn/matlabcentral/answers/345972-how-to-make-2d-graph-with-3-data-set

评论： Star Strider 2017-6-27

hi, I was wondering if someone can give me a hint how to create a multiple line graph where each line will be associated to certain Z line for example. I have data like attached where x is first column and so on.

So I want to have a 2D graph with x and y scatter points, and then through these points sometimes will pass a line that reflect a z column. Z column ranges between 16 and 145 m. It would be great if I can have lines at 15 35 55 75 95 115 135 155 m for example. Thanks a lot!

I have a scatter with but cant figure it out how i can plot lines at these intervals corresponding to Z values:

x=all(:,1);
y=all(:,2);
z=all(:,3);
pointsize = 10;
scatter(x, y, pointsize, z);

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采纳的回答

Star Strider 2017-6-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/345972-how-to-make-2d-graph-with-3-data-set#answer_271699

在 MATLAB Online 中打开

See if this does what you want.

The Code —

D = load('sensation scatter_test.txt');
[Du,~,ic] = unique(D(:,2));                             % Unique Values — Second Column
xc = accumarray(ic, D(:,1), [], @(x) {cat(3,x)});       % Accumulate ‘x’ In 3D Matrix
yc = accumarray(ic, D(:,2), [], @(x) {cat(3,x)});       % Accumulate ‘y’ In 3D Matrix
zc = accumarray(ic, D(:,3), [], @(x) {cat(3,x)});       % Accumulate ‘z’ In 3D Matrix
figure(1)
for k1 = 1:size(xc,1)
    plot3(xc{k1}, yc{k1}, zc{k1})                       % Plot Each ‘(x,y,z)’ Separately On Same Axes
    hold on
    lgnd{k1} = sprintf('%6.2f',yc{k1}(1));              % Create Legend Entries
end
hold off
grid on
view([0  0])                                            % Rotate 3D Plot To 2D
legend(lgnd{:}, 'Location','SE')