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Clearing Global variables... except for.

Asked by Trevor Harris on 11 Oct 2012
Hey all,
I wish to clear all my global variables apart from two. So I've generated a cell array of strings that contain all my global variables and removed the two I wish to save:
globals = who('global');
globals = globals(~strcmpi(globals,'waitGUI'));
globals = globals(~strcmpi(globals,'decayFig'));
This is where I'm stuck. How do I clear all the variables who's names of the variables are strings within the cell array "globals"? Thanks!
Trevor

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4 Answers

Answer by Daniel Shub
on 11 Oct 2012
Edited by Daniel Shub
on 11 Oct 2012

To remove the variables locally
clear(globals{:})
to remove them globally
clear('global', var{:})
You should also look into the regexp support of clear and the -except flag.
clear -global -except waitGUI decayFig

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I tried that, it didn't work. This is from my command line:
K>> globals = who('global')
globals =
'SaveData'
'crossPlot'
'dataPan'
'decayFig'
'dpDecay'
'dpXUnfiltered'
'fitLine'
'fitType'
'fitTypeString'
'hAxes'
'll'
'll2'
'll3'
'peaksPlot'
'peridYLabel'
'periodAxPlot'
'pfit'
'ssFFT'
'ssTT'
'timeTraceUnfiltPlot'
'troughsPlot'
'waitGUI'
'xunitBase'
'yunitIs'
K>> clear(globals{:})
K>> who('global');
Your variables are:
SaveData dpXUnfiltered ll periodAxPlot troughsPlot crossPlot fitLine ll2 pfit waitGUI dataPan fitType ll3 ssFFT xunitBase decayFig fitTypeString peaksPlot ssTT yunitIs dpDecay hAxes peridYLabel timeTraceUnfiltPlot
Sorry I thought you wanted to do it locally. To do it globally is essentially the same, except you need the global flag. You really should read the documentation of clear, since there are a number of better ways of doing this.

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Answer by José-Luis
on 11 Oct 2012
Edited by José-Luis
on 11 Oct 2012

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Answer by Image Analyst
on 11 Oct 2012

Here's one way. Just save what you want into local variables, then destroy all globals, then recreate the globals you want:
% Save into local variables.
saved_waitGUI = waitGUI;
saved_decayFig = decayFig;
% Clear all globals
clear global;
% Redeclare globals
global waitGUI;
global decayFig;
% Restore the globals we wanted to keep
waitGUI = keep_waitGUI;
decayFig = keep_decayFig;

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Jan
Answer by Jan
on 11 Oct 2012

A meta-answer: Avoid working with GLOBALS. There are always better solutions which do not make the debugging a trip to hell.

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