How to save all global variables?

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Guido
Guido 2013-2-14
评论： Stephen23 2017-12-20
The save command only saves those Matlab variables which are visible in a workspace. It does not, however, cover the global variables which are reported by who('global') but have not been declared as globals in this workspace. Is there a way to save all global variables in a given Matlab session, even if their names are not known a priori?

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Jan
Jan 2013-2-14
编辑：Jan 2013-2-21
While I recommend not to use global variables, because they impede the debugging dramatically, there should be a solution to your problem.
When you want to save the variables, which are found by who('global'), it would be a simple idea to use globalVars = who('global') to get a list of these variables at first. Then the values might not be known inside a function. So, sigh, I have to suggest to one and only case, which I cannot solve without eval.
globalVars = who('global');
for iVar = 1:numel(globalVars)
eval(sprintf('global %s', globalVars{iVar})); % [EDITED]
end
This can overwrite local variables by accident, e.g. if "globalVars" is a global variable itself, this approach is buggy. Therefore I strongly recommend to choose a different strategy. The complexity caused by the automatic access of global variables cannot be managed reliably. And when there is the decision between a complicated and inherently buggy method and a clean and clear one, <not every sentence has to be finished>
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Sean Herbert
Sean Herbert 2016-2-25
another way, without a for loop:
globalVars = who('global')'; %notice the '
glob_str = sprintf('global %s',strjoin(globalVars));
%create them
eval(glob_str)
Stephen23
Stephen23 2016-2-25
编辑：Stephen23 2016-2-25
These "solutions" should all be given the caveat "Only for entertainment purposes, NEVER use in serious code!"

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Tarun Luthra
Tarun Luthra 2017-12-19
I am trying to do same thing. how do I save something inside a function such as a global variable out to workspace?

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