MATLAB: Global variables not cleared after ‘clear;clc’

global variable

I have a global variable. I run the code for several times. I put 'clear;clc' at the front. Strangely before the global variable is called, it already has a value. However I rerun it, it always has a value before its line is called. What could've happened?

Best Answer

clear by itself only removes variables from the current workspace not the global workspace . You need to

clear global

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MATLAB: How to save all global variables

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>

MATLAB: Clear all

Can you plot the code around where you include the "Clear All"? Also, a bit of a long shot here, but you could try pause(1), to keep it from running like crazy.

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MATLAB: How to save all global variables

MATLAB: Clear all

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