MATLAB Central Newsreader - How to clear all variables except one or two

How to clear all variables except one or two

Diego Zegarra — Sat, 31 Jan 2009 23:40:17 -0500

I have a code that creates many variables and at each iteration I want to clear all the variables except for one or two. Is this possible without specifying clear A, clear B and so on for every variable?

I know clear all deletes them all but I need to keep one of them.

Thanks

Re: How to clear all variables except one or two

Matt Fig — Sun, 01 Feb 2009 00:11:01 -0500

Do a search on the FEX for: keep

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Re: How to clear all variables except one or two

Diego Zegarra — Sun, 01 Feb 2009 00:37:01 -0500

Actually I found a way that can be done easily, this for anyone out there needing this info,

clearvars -except v1 v2 ... clears all variables except for those specified following the -except flag. Use the wildcard character '*' in a variable name to exclude variables that match a pattern from being cleared. clearvars -except X* clears all the variables in the current workspace, except for those that start with X, for instance.

Re: How to clear all variables except one or two

Matt Fig — Sun, 01 Feb 2009 00:51:02 -0500

What version are you using? I don't have a clearvars command.

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Re: How to clear all variables except one or two

Diego Zegarra — Sun, 01 Feb 2009 01:23:02 -0500

R2008a, I think it just came out starting this version.

Re: How to clear all variables except one or two

Jan Simon — Sun, 01 Feb 2009 22:57:01 -0500

Dear Diego Zegarra!"

> I have a code that creates many variables and at each iteration I want to clear all the variables except for one or two. Is this possible without specifying clear A, clear B and so on for every variable?

Let the names of all variables, which should be cleared, start with a specific string, e.g.
"away_". Then "clear away_*" deletes them from memory.

By the way: clearing and recreation of variables is very time consuming. It could be more effective to use a cell instead of a cloud of variables.

Good luck, Jan Simon

Re: How to clear all variables except one or two

Steven Lord — Mon, 02 Feb 2009 15:49:53 -0500

"Diego Zegarra" <diegozbb@gmail.com> wrote in message
news:gm2thm$mcb$1@fred.mathworks.com...
> R2008a, I think it just came out starting this version.

You're correct, CLEARVARS was introduced in release R2008a.

http://www.mathworks.com/access/helpdesk/help/techdoc/rn/brjk1q5-1.html

--
Steve Lord
slord@mathworks.com