How do i scale the Axes in connection with my Signal?

I have some test Signals with different Frequences each with a different (time)- length. How can i use the input of the signal to scale the time axis of my GUI?

case 'hChan5' plot(handles.axes1,(1:length(data_xx(:,5))), (-4*data_xx(:,5) + data_xx(:,1) + data_xx(:,10) + data_xx(:,4) + data_xx(:,6))); handles.button = 'hChan5';

this is the plot of one of those frequences. Now i want to use this to scale the time axis.