Hey James, I understand you have a script that is creating a 2D animation by calling the "plot" function multiple times and that you have implemented a way to change the animation speed based on the value of a variable called "TimeExpansionFactor". I further understand that you want to be able to change the value of "TimeExpansionFactor" without pausing execution of the animation.
If the above if correct, the most straightforward want to accomplish your goal is using a figure's "Key-press callback function". You can read about this function more at the link below.
MATLAB automatically passes an object containing data that has the character that was pressed. You can write some conditional statements checking the character and, assuming your define the "KeyPressFcn" in the scope of the function that contains the variable, you can update "TimeExpansionFactor" accordingly.
You could also check, in the callback, for the last key pressed using the Figure's "CurrentCharacter" property. In the callback you might have something like
if double(get(yourFigureHandle,'CurrentCharacter')) == 30 % i.e., if UP arrow was pressed
%adjust TimeExpansionFactor to make animation faster
elseif double(get(yourFigureHandle,'CurrentCharacter')) == 31 % i.e., if DOWN arrow was pressed
%adjust TimeExpansionFactor to make animation slower
end
Also, make sure you do not make a new figure each time you plot but just update the "YData" of the current axis.
You can find more information about callbacks in general at the documentation linked to below.
