% !log_variables  Restrict the steady stae of some of the variables to be positive.
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% Syntax
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%     !log_variables
%         list_of_variables
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% Inverted syntax
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%     !log_variables
%         !allbut
%         list_of_variables
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% Description
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% Example
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% -IRIS Toolbox.
% -Copyright (c) 2007-2012 Jaromir Benes.
