W = evalin('caller','who global') returns an error

Question

Leo Simon 2020-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/546056-w-evalin-caller-who-global-returns-an-error

评论： Walter Roberson 2020-6-10

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

The command

evalin('caller','who global')

correctly returns the global variables in the caller workspace, but

W = evalin('caller','who global')

returns the error message

Error: illegal use of the reserved keyword global

Yet the syntax of the line that throws the error is consistent with the prescribed use of evalin. Is this a bug? What's the workaround? Thanks

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Leo Simon 2020-6-10

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Thanks Steven, here's an mwe, illustrating how I use the evalin syntax. I have decades of globals scattered all over the place, and backward compatibility means that I need a solution (Walter's works perfectly well). But if you have suggestions about alternatives to my use of evalin, I'd be most interested in hearing them.

function parent
global delta
child('gamma',5,'delta',6);
function child(varargin);
W = evalin('caller','who("global")');
for ii=1:2:numel(varargin);
	Variable	= varargin{ii};
	if ~isempty(strmatch(W,Variable));
		disp([ Variable ' is a global variable but you passed it as an argument to varargin; don''t do that']);
		keyboard;
	end;
end