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function p=plus(p1,p2)
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% plus - sum of twp ppoly objects
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%
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% p=p1+p2
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%
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% p, p1, p2 - ppoly objects
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% Copyright (c) Dingyu Xue, Northeastern University, China
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% Last modified 18 May, 2022
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p1=ppoly(p1); p2=ppoly(p2);
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a=[p1.a,p2.a]; na=[p1.na,p2.na]; p=collect(ppoly(a,na));
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end
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