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19 lines
475 B
19 lines
475 B
%--------------------------
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% @Author: Jingqiao Hu
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% @Date: 2020-12-16 15:40:22
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% @LastEditTime: 2020-12-16 15:40:30
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% I = eye(3);
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% PP = u*(F + F'-2*I) + l * trace(F-I) * I;
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%--------------------------
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function P = PK1_fast_linear(u, l, F)
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m = size(F,2);
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FT = F([1:3:9,2:3:9,3:3:9], :); % [9,m]
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trF = F(1,:) + F(5,:) + F(9,:) - 3; % 1*m
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I = eye(3);
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I1 = repmat(I(:), 1, m); % 9*m
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P = u(:)' .* (F + FT - 2*I1) + l(:)' .* trF .* I1;
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end
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