Hi,

I asked this before and searched a lot of times but i couldn't find a solution.

My want to plot 3 graphs and change one of them's value with a slider. But each time I use the slider to change the value, it plots another graph and keeps the old ones (like this: http://i40.tinypic.com/2uelhcl.jpg). 

Here is my files: http://duckload.com/download/465993/untitled.rar  

I will be very happy if anyone can fix it or give me an example file. Thanks for your help.

Regards

any help?

Hi Nuri,

What you should do is find the handle of the green line you would like to move.

The way to do it is the following:

1. When you plot the green line the first time, in your slider1_CreateFcn, keep its handle by 

lineHandle = plot(... % your green line plot.

2. Then carry this on to your other callbacks by putting it into the handles structure:

handles.greenLine = lineHandle;
guidata(hObject, handles);

3. Now, in slider1_Callback, retrieve this handle:

lineHandle = handles.greenLine;

4. Once you do that, you can now modify the xData and yData properties of your line using the variable lineHandle. Something like:

% new values according to slider value
newXData = ...
newYData = ... 
set(lineHandle,'xData',newXData,'yData',newYData);

This way, you are updating the data of your line, rather than making a new line.

Best.