How can I use a slider step to create a graph through a for loop?

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Hello. I am trying to develop a graph through the use of a slider in a GUI. I can create this graph with a push button. The graph is created through a for loop. This is an educational idea, since I want the users to see the step by step creation of the graph and not just the final graph.

Accepted Answer

Walter Roberson
Walter Roberson on 10 May 2016
Yes, you can do that. MATLAB does not distinguish between a uicontrol('style','slider') being stepped (by arrow keys) or directly moved to, in terms of triggering callbacks. So just read out the current Value of the uicontrol, decide how many points of output that implies, take the appropriate subset of the x vector and y vector, update your graph.
If the idea is that each iteration of the loop is to "step" to the next location, then there is no direct way to tell the uicontrol to step. In theory you could use Java Robot to issue the keystrokes, but that is a bit of a waste. get() the current Value, add something to it, set() the Value, call the callback function directly. (When you set() the Value of a uicontrol, that does not trigger a callback, so you need to invoke the callback.)
Better yet, have the callback mostly be getting the current value of the slider and calling an update routine with the current value; then your for loop would just iterate over the values and call the update routine directly, possibly set()'ing the slider Value to imitate the slider being moved along.
Remember to drawnow() after you upgrade graphics in a loop.
  1 Comment
Alfonso Rodriguez
Alfonso Rodriguez on 10 May 2016
Thanks Again! This knowledge of using a slider is totally new for me. I`m glad you understood my problem.

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