Olympic puzzle number one

Jan
2012 7 31
5 个回答
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7 次查看（30 天）

4 个投票

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.

3 个评论
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John Petersen
John Petersen 2012-7-31
编辑：John Petersen 2012-7-31
Would somebody please answer this so I can use clear again? aaaah... Thanks Mike!!
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

2 个投票

system('matlab &');quit

1 个评论
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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

3 个投票

  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.

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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

3 个投票

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

3 个投票

Missing from the obvious solutions are:
clear = str2func('clear'); clear();
and
feval('clear');

3 个评论
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Sean de Wolski
Sean de Wolski 2012-7-31
编辑：Sean de Wolski 2012-7-31
Nice! I would've thought the str2func solution would have recursively called itself.
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

1 个投票

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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Sean de Wolski
Sean de Wolski 2012-7-31
clearvars is just a fancy wrapper for evalin with clear.
edit clearvars
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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