For Greg’s point about linkdata for images, we agree that this would be good to do, and it definitely adds weight to the idea to hear customers ask for it specifically.

I am not able to help you further debug in this way. If you have maintenance on your license, you can contact tech support and perhaps someone there can walk through it with you. http://www.mathworks.com/support/service_requests/contact_support.do

I run the same code. x_remain is the same as origX although y_remain is different from origY.

Not sure what is wrong…

Thanks.

Sincerely,
Chee

h = deleteData();
origX=get(h,'XData')
origY = get(h,'YData')

Remove some points with the data brush tool, and then follow up with:

x_reamin=get(h,'Xdata')
y_remain = get(h,'YData');
whos

You can see that the x_remain vector is smaller than the xOrig vector.

I still have questions in accessing the brushed data in a function.

The function I write is like this

function h = deleteData()
x = 1:100; y = 1:100;
h = plot(x,y,’.',’XDataSource’,'x’,'YDataSource’,'y’);
linkdata on;
brush on

Then, I call this function
h = deleteData();
and interactively delete some points, now, I want to access the points left in the figure,
x_remain = get(h,’XData’);
y_remain = get(h,’YData’);

x_remain and y_remain are still the same as the original x and y.

Is there a way to access the points that remain in the figure? Thanks.

I am not sure what is you are ultimately looking for. If you brush a linked plot, the changes are reflected in the originating workspace variables. If you want to know what changed, you can retain an original (non-linked) copy of that data and use set functions to find the indices that changed.

I am trying to write a program to let users to select points from a figure (say, I have 100 points with x and y variables) using the new data brushing function, then when the user delete the brushed points, these points will also be deleted from the original variables x, y.

So my question is: is it possible to return the indices of the brushed data so that I can update x and y when the points are deleted? When using linkdata and databrush, I can clearly see that the selected points are highlighted in variable editor window, so it seems possible to do that. However, neither linkdata and databrush does not provide an output variable to store the indices of the brushed variable. Is there a way to get around this? Thanks.

chee

Unfortunately I don’t have a version of that code that meets my standards for sharing, however the basic idea is this:

Set the bytes available callback of the serial object to a sub-function which contains code such as:

x_vector(end+1) = x_vector(end)+1;
y_vector(end+1) = fread(s,1); %read in data
set(plot_line_handle,'Xdata',x_vector,'Ydata',y_vector);

In this case I’m just updating the line object and not the whole plot. The first time through I create a new plot with:

plot_line_handle = plot(0,y_0);