Olympic puzzle number one

2 次查看（过去 30 天）
Jan
Jan 2012-7-31
Daniel has provided this nice puzzler:
clear = @()disp('Have fun undoing this (:');
Let's solve this challenge and restore the original clear command in as many ways as you find.
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Daniel Shub
Daniel Shub 2012-7-31
Credit should really be given to Loren.
Jan
Jan 2012-7-31
Yes, extra credits for Loren. Extra point for Daniel for the link to Loren's blog!

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采纳的回答

Sean de Wolski
Sean de Wolski 2012-7-31
system('matlab &');quit
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Jan
Jan 2012-7-31
编辑：Jan 2012-7-31
The rebirth method! +1 from Heidelberg!
On stage deeper: WinPower('rebootmatlab', 'which clear -all') I've always known that this tool will be useful for anything sometimes.

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更多回答（4 个）

Mike Hosea
Mike Hosea 2012-7-31
编辑：Mike Hosea 2012-7-31
  1. builtin('clear','clear')
  2. You can delete the variable from the workspace window (highlight and press delete or right click and delete).
I look forward to reading some more creative ways.
  2 个评论
Jan
Jan 2012-7-31
编辑：Jan 2012-7-31
First! Thanks for taking the builtin out of the race. The workspace browser is an almost external tool to operate in the workspace. +1
Daniel Shub
Daniel Shub 2012-8-1
I wonder if the workspace window method method can be accessed by a java method from the commandline.

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Sean de Wolski
Sean de Wolski 2012-7-31
clear = rand(1000,500,700);
pack
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Daniel Shub
Daniel Shub 2012-7-31
I like this solution.
Jan
Jan 2012-7-31
Relief by much beef. The weight-lifting method.

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Daniel Shub
Daniel Shub 2012-7-31
Missing from the obvious solutions are:
clear = str2func('clear'); clear();
and
feval('clear');
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Jan
Jan 2012-7-31
编辑：Jan 2012-7-31
Re-identification using str2func is fine. I'm surprised that feval does not fail. Most of all: The first approach contains "clear" three times. This is the winner in synchronized swimming.
Mike Hosea
Mike Hosea 2012-8-1
If you wanted to leave the rest of the workspace undisturbed it would have been four mentions of "clear":
clear = str2func('clear'); clear('clear');

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Daniel Shub
Daniel Shub 2012-7-31
Somewhat surprisingly the CLEARVARS function is not a solution and gives an unhelpful error message. I think the failure probably qualifies as a bug.
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Jan
Jan 2012-7-31
Disqualified. Who cares, the most important thing is not to win but to take part!
Daniel Shub
Daniel Shub 2012-8-1
@Sean, my point was that it could be a slightly fancy wrapper that could catch this error

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