How to determine Coordinates in a plot

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Stephan 2017-5-10

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关闭： Stephan 2017-5-23

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Hello everyone,

I have the following simplified code, creating a subplot in one larger main plot. I want to draw a line between points (A) and (B) by

plot([1.5,1.9],[1.5,2],'LineStyle','--')

I don't know how to determine the coordinates [1.5,1.9],[1.5,2] automatically.

Thanks for any help!

   figure
hold on;
plot(magic(2)); 
plot([1.5,1.9],[1.5,2],'LineStyle','--')
axes('Position',[.2 .2 .3 .3])
plot(magic(2));
text(2,0.2,'\leftarrow from this corner (A)');
text(3,2,'\leftarrow to this point (B)');
hold off

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Stephan 2017-5-12

Consider the corner at about x=0.2, y=0.2. This corner is not exactly in x=0.2, y=0.2. I want to know the exact x- and y-coordinate of this point.

Gaurav Ahuja 2017-5-16

the Coordinates in a plot of the points plotted are saved in the corresponding object's (say line object) Xdata and YData (or Zdata).

if you are looking at the edges of axes, that information can be extracted from the 'position' field of the axes and 'Units' are generally normalized.

take a look at the following link to understand how to get these values, and you can tweak some code for your use case.

I agree with @Jan Simon, you do need to identify those requirements and ask a specific question again.

And how do you wish to get these coordinates, graphically or in a script?

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