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function key=isfoss(G)
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% isfoss - check whether input is an FOSS object
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%
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% key=isfoss(G)
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%
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% G - an FOSS object
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% Copyright (c) Dingyu Xue, Northeastern University, China
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% Last modified 28 March, 2017
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% Last modified 18 May, 2022
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key=strcmp(class(G),'foss');
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end
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