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Is there a way to continue operation during input()?

Asked by Bohan Yao on 16 Aug 2019
Latest activity Answered by per isakson
on 18 Aug 2019
So what I'm essentially trying to do is, I have a switch statement in a while loop. Using an input() function, MATLAB will take the user input and put it through the switch cases. Pretty simple. But now, I want to modify it such that if MATLAB does not receive a command during input() for X number of seconds, it will continue the code, instead of waiting for user input. Ineveitably, it will go to the default switch case becuase a null input will not match any of the cases, and then the while loop will take me back to input(). So is there a way to "unpause" the code during input() automatically without me having to press ENTER?

  2 Comments

Your best choice is to write a GUI: a well-designed GUI is anyway a much better user-interface than input.
I agree, however, I am working with someone else's code, which they have already developed extensively. Implmenting a GUI would require a lot more work than is worth it. Is there another way to do this with just input()? If there truly is no other way to do it, then I guess I have no choiec but to create a GUI.

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2 Answers

Answer by Walter Roberson
on 18 Aug 2019

https://www.mathworks.com/matlabcentral/fileexchange/8297-getkeywait
The below two mostly rely on Psychtoolbox
https://www.mathworks.com/matlabcentral/answers/310311-how-to-get-psychtoolbox-to-wait-for-keypress-but-move-on-if-it-hasn-t-recieved-one-in-a-set-time
https://www.mathworks.com/matlabcentral/answers/143088-real-time-detect-keypress

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Answer by per isakson
on 18 Aug 2019

Something like
%% a script named cssm.m
while true
user_input = waitinput( 'prompt: ', 5, 's' );
if isnan( user_input )
user_input = 'default';
disp(' ')
end
switch user_input
case 'default'
disp('default')
case 'poi'
disp('poi')
case 'abc'
disp('abc')
case 'quit'
disp('good bye')
break
otherwise
error('failure')
end
end
might do the trick. That is to say waitinput by Grzegorz Knor does the trick.
And a little test
>> cssm
prompt:
default
prompt:
default
prompt: poi
poi
prompt:
default
prompt: quit
good bye

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