Hi @DJ V
I am unable to address all questions in a single post, as some require knowledge of aerospace engineering. However, to achieve the functionality of increasing and decreasing the value of a variable x in MATLAB based on key presses, you may consider the following approach:
%% create a function file for "keyPressExample.m"
function keyPressExample()
% Initialize variable
x = 0; % Initial value
increment = 1; % Amount to change x
isFPressed = false; % Flag for F key
isSPressed = false; % Flag for S key
% Create a fig
fig = figure('KeyPressFcn', @keyPress, 'KeyReleaseFcn', @keyRelease);
% Start a timer to update x
t = timer('ExecutionMode', 'fixedRate', 'Period', 0.1, 'TimerFcn', @(~,~) updateX());
start(t);
% Nested function to handle key press
function keyPress(~, event)
switch event.Key
case 'f'
isFPressed = true;
case 's'
isSPressed = true;
end
end
% Nested function to handle key release
function keyRelease(~, event)
switch event.Key
case 'f'
isFPressed = false;
case 's'
isSPressed = false;
end
end
% Nested function to update x
function updateX()
if isFPressed
x = x + increment; % Increase x
elseif isSPressed
x = x - increment; % Decrease x
end
disp(x); % Display the current value of x
end
% Clean up when figure is closed
set(fig, 'CloseRequestFcn', @(src, event) closeFigure(src, t));
end
%% create a function file for "closeFigure.m" (Click the "×" button to close)
function closeFigure(fig, t)
stop(t);
delete(t);
delete(fig);
end
