spy, making nodes more visible

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Jan 2016-9-24

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评论： Jan 2016-9-26

How do I modify the Matlab command spy to have more visible (red) nodes of graphs? Say something like this THIS on page 7.

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John D'Errico 2016-9-24

编辑：John D'Errico 2016-9-24

在 MATLAB Online 中打开

Um, I suppose that is a valid question. Is it not obvious? :) Ok, maybe not completely so.

The trick is to recognize that when you do a spy plot, you created a set of axes. The handle to those axes is given by gca (the current set of axes that are up front.)

So if you do

get(gca)

you will see lots of things. One of them is 'children'. What you actually plotted are children of those axes. So

get(gca,'children')

gives a handle to what is in the plot. In this case, it is only one thing, a set of dots as line, created by spy.

get(gca,'children')
ans = 
Line with properties:
              Color: [0 0 1]
          LineStyle: 'none'
          LineWidth: 0.5
             Marker: '.'
         MarkerSize: 50
    MarkerFaceColor: 'none'
              XData: [1 1 3 4 6 6 8 8 8 10]
              YData: [4 9 4 7 5 6 2 3 6 10]
              ZData: [1x0 double]

So now you can control the properties of that plot. You can change the markersize. You can change the color of the dots, both of which I did.

Obvious? I suppose it is not, depending on your programming background. But not that hard once you start to learn about handle graphics in MATLAB. You could start reading under 'Graphics Objects' in the docs.

Jan 2016-9-26

OK, and what about this: How do I make nodes in "spy" that are closer then "d" connected via solid (OR dotted) line?

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Answer 1

John D'Errico 2016-9-24

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/304334-spy-making-nodes-more-visible#answer_235940

编辑：John D'Errico 2016-9-24

在 MATLAB Online 中打开

spy(sprand(10,10,.1))
set(get(gca,'children'),'markersize',50,'color','r')
get(gca,'children')
ans = 
Line with properties:
              Color: [0 0 1]
          LineStyle: 'none'
          LineWidth: 0.5
             Marker: '.'
         MarkerSize: 50
    MarkerFaceColor: 'none'
              XData: [1 1 3 4 6 6 8 8 8 10]
              YData: [4 9 4 7 5 6 2 3 6 10]
              ZData: [1x0 double]