what does this error with tic\toc means?

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i have this problem - matlab tells me I have an error while running-
Error using toc
You must call TIC without an output argument before calling TOC without an
input argument.
Error in hand_rotation2/youPress (line 126)
c = toc;
Error while evaluating figure KeyPressFcn
what does it mean, and how can I fix it?

Accepted Answer

Wayne King
Wayne King on 15 Oct 2012
Edited: Wayne King on 15 Oct 2012
It means to use toc, you have to call tic first somewhere
tic;
for ii = 1:10
x(ii) = ii+1;
end
y = toc;
If you use toc by itself, it must have been preceded by a tic command sometime during the current session, then it gives the time since the most recent tic command. In this latter case, that is probably not what you want.
  2 Comments
Image Analyst
Image Analyst on 15 Oct 2012
Maybe the tic doesn't survive once you've exited the function.

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More Answers (1)

Nicolas Rodriguez
Nicolas Rodriguez on 8 Jan 2016
I have the same problem. My code runs as long as I keep matlab open. Once I close it, it won't let me run it and show me error

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