keep

KEEP is complementary to the "clear" command: it keeps the supplied variables and deletes the rest.

Description

KEEP is complementary to the "clear" command: instead of clearing the supplied variables, it keeps them and deletes the rest.

For example, the command " keep x y " clears all variables from the workspace except x and y.

• Acknowledgements: This submission has inspired the following:; KEEP3, keep2, Keep4, keepfield
• MATLAB release: MATLAB 5.2 (R10)

[Suresh Joel]

Cool function - simple and useful

[Matt Remigy]

Thanks !

[Till Bockemuehl]

Nifty function. Exactly what I was searching for.

[Rasmus Anthin]

Superb! I think it is obvious there should be a reciprocal to the clear function like this in matlab's inherent set of functions.

[B. Peña]

thanks

[Fahad Mahmood]

Smart function indeed! Good thing for us that you thought about it!

[Yaser Ahmed]

 

[Ilker Delice]

Thanks a lot excellent work

[joep van berkel]

great !!

[Athanasios Pechlivanis]

You are great!!

Thanks a lot, you have saved much of my time!!

[Camilo Cano]

Just wonderful. Works like a charm. Thanks a lot.

[Hui Shi]

yes, that's exactly what I am looking for.
Thanks!

[Yi Li]

Good job!

[D. Gietelink]

Perfect! why is this not a standard matlab function yet?

[Jerome G.]

Exactement ce que je cherchais.

[Ivan Ordonez]

It is a very good and practical tool.

[Benjamin Fenech]

 

[Kristofer Svensson]

 

[Andrew Lingg]

Very nice for cleaning up memory while holding onto important results

[Daniel Vasques]

I agree this should come with MATLAB.

[Christoph Ullrich]

Super - saves lines and lines of clean codes...

[Taon Khuu]

Excellent little function!!!

[Andre Crawford]

This file saves lots of time and extra coding.

[Andrew Gee]

This is gold

[Mauricio Fernandez]

Muchas gracias por tu trabajo, good job.

[J J]

Why on earth is this function not part of MATLAB to begin with??

[Sulabh Dhanuka]

Though simple in idea, it is such a useful function. I have wished for something like this for so long. I agree, it makes no sense for this to be a part of Matlab.

[M M Dupin]

Dear MATLAB developers, please listen to users and add this *extremely* useful function in the core of MATLAB. Plus, it has already been tested by us!

[Mark Thommy]

A very helpful piece of code, just what I needed. Well done to the author!

[Cornelis P. Bogerd]

Excellent

[Chris Andrews]

I love having this script. Thank you for posting!

[H D]

Does Mathworks need to pay a lot to make this function in the built-in lib?

[Matthew Rydzik]

Perfect code, Thanks!

[Sushil Subramanian]

Excellent tool! MATLAB should include this.

[K R]

Brilliant! This is incredibly useful.

[Touko Pouko]

Bravissimo!

[Kristyn Falkenstern]

Thank you! this is great.

[Thomas Deneux]

looks great, but the code can be much more simple!
for example,

function keep(varargin)

% variables to clear in a cell array
varlist = evalin('caller','who');
varlist = setdiff(varlist,varargin);

% make a string (separate the variable by a space)
[varlist{:,2}] = deal(' ');
varlist = varlist';
varstr = [varlist{:}];

% and clear!
evalin('caller',['clear ' varstr])

[Florian]

 

[shah]

thanks

[Thorsten]

I used the code by Thomas Deneux, which was really helpful and instructive. However, maybe due to an old MATLAB version, it didn't work for me with many variables to be cleaned.

Modifying the middle block like this worked fine for my, although it's a rather crude fix...

% make a string (separate the variable by a space)
% [varlist{:,2}] = deal(' '); modified
varlist=strcat(varlist, '?');
varlist = varlist';
% varstr = [varlist{:}];
varstr=regexprep([varlist{:}],'?',' '); % modified

[Tina Hegarty]

Really handy little script. Saves lots of time as well as minimising size of saved workspaces. Many thanks.

[Ray Ducharme]

FYI, users with newer version can now use "clearvars -except". To 'keep' old habits...

 function keep(varargin)
    evalin('caller',['clearvars -except ' char(varargin)]);
 end

call...
 keep 'x y'

Thanks David for the original function!

[Ray Ducharme]

 

[Airballman]

Just magic,

Thx :)

[Grzegorz Knor]

Very useful function and simpler than regular expressions.

[Brady]

 

[Michael]