creating a coundown alarm everytime a function have been asked

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Mouhamad Ibrahim 2021-2-28

0
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https://ww2.mathworks.cn/matlabcentral/answers/758459-creating-a-coundown-alarm-everytime-a-function-have-been-asked

回答： dpb 2021-2-28

Hello, basically what I want to do is that i want to create a simple function like this:

function [] = alarm()

print("5 seconds to wake up")

end

and everytime i call the function without giving it any initial parameter i want the countdown to decrement so the first time i call it: alarm() return: 5 seconds to wake up

second time: alarm() return 4 seconds to wake up

etc... to reach 0

how can i do that ?

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Answer 1

dpb 2021-2-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/758459-creating-a-coundown-alarm-everytime-a-function-have-been-asked#answer_635569

在 MATLAB Online 中打开

function [] = alarm(varargin)
% alarm -- display countdown left
% Optional arguments
%   'init' -- reset counter
persistent SECS
% handle optional arguments, then quit
option=[varargin{:}];
if strncmpi(option,'init',3), SECS=5; return, end
disp(compose("%d seconds to wake up",SECS))
SECS=SECS-1;
end

Above doesn't have niceties of additional options to reset to a new/different time nor does it handle underllow gracefully...but the general idea. Altho I fail to see how can be of any real value as described...