Strange results from tic / toc.

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John Doe
John Doe 2013-5-9
I'm checking the running time of a function using tic/toc. I write the following in the command window (and execute it simultaneously):
tic
res = checkFunc('case2736sp',1:3000);
toc
Elapsed time is 0.080491 seconds.
where checkFunc returns a 2736x2500 full matrix.
What puzzles me is that I have to wait almost 20 seconds for the output saying the run time is only 80 ms.
Does anyone have a clue why this is?

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cr
cr 2013-5-9
编辑：cr 2013-5-9
Are you sure 'checkFunc' does NOT do a tic somewhere in its code? Anyways, this would be a better way to test:
tx = tic; res = checkFunc('case2736sp',1:3000); toc(tx)

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