I want to create a plot using X Y coordinates

Question

George Sfinarolakis 2021-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/734280-i-want-to-create-a-plot-using-x-y-coordinates

评论： Maheedhar Korimi 2022-10-31

I have 51 nodes that each one of them has X Y coordinates. I used the command: plot(x,y, 'd') but I would like the figure to show me the number of each node next to the diamond.For example the first node I'd like to have the number 1 next to it, the second the number 2 etc. Also I'd like the first node to be different shape or colour from the others. Do I have to use two different types of plot or it can be done in the same command? Thank you for your time.

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Answer 1

Star Strider 2021-2-2

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编辑：Star Strider 2021-2-2

在 MATLAB Online 中打开

Use the text function.

Example: —

x = rand(1,5);
y = rand(1,5);
nrc = compose('%2d',1:numel(x));                % Coordinate Numbers (Cell Array)
cm = jet(numel(x));                             % Use The ‘colormap’ Of Your Choice
figure
scatter(x, y, 75, cm, 'd', 'filled')
grid
text(x, y, nrc)

EDIT — (2 Jan 2021 at 19:18)

Changed from plot to scatter since it provides more options, especially with respect to colouring the points. There are a limited number of shapes, so I would just go with changing the colours. The sizes of the plotted points can chnage with the colours with scatter.

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George Sfinarolakis 2021-2-2

Thank you very much for your time! It worked

Star Strider 2021-2-2

As always, my pleasure!

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Answer 2

Walter Roberson 2021-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/734280-i-want-to-create-a-plot-using-x-y-coordinates#answer_613115

在 MATLAB Online 中打开

 plot(x, y)
 text(x, y, string(1:numel(x)))

Now scatter(x(:), y(:), Pointsize, C)

where C is a numel(x) by 3 color array in which you set the first row to be different from the others. You can also set the marker shape on the call.

Limitations:

all of the markers for the same plot line must be the same color and shape (unless I am forgetting a recent change)
all of the markers for a single scatter call must be the same shape