graph

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armin
armin 2011-6-28
hi
how can i select a point from a graph? i have a graph and i want to select a point from it and do some works with its coordinate(x & y). i want to select on graph and recieve x & y coordinate
thank u
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Kavish Chaurasia
Kavish Chaurasia 2011-6-29
there is a tool to locate the coordinate on a particular graph, which could be seen as an icon on the graph window.

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Gerd
Gerd 2011-6-28
Hi Armin,
you can use datacursor mode.
In the callbackfunction you can play with the points (x & y ) received from the callback. If you do need an example leave me a note.
Gerd
  1 个评论
Gerd
Gerd 2011-6-29
Hi Armin,
of course you can use a GUI to fulfill your requirements but you don't have to use one.
Here is short example:
x=linspace(0,10,1000);
y=sin(x);
plot(x,y)
dcm = datacursormode;
Now you can click into your figure and the x and y values are displayed.
If you want to calculate something with these values you can simply type
position = getCursorInfo(dcm);
in the command window and you have the answer of the position in the graph.
You can also use the callback function by typing
set(dcm,'UpdateFcn',{@myupdate})
Now the myupdate function is called everytime you click into your figure.
Please have a look at the documentation
help datacursormode
The command is well documented.
Gerd

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更多回答（1 个）

Gerd
Gerd 2011-6-29
When you run your m-file and nothing is selected on the graph the position variable is empty. When your m-file is finished the position is stored and you can display the result in the command window. I would suggest to use the callback function so everytime you click on your figure you receive the position values.

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