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18 lines
445 B
18 lines
445 B
3 years ago
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%--------------------------
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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(2,2);
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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([1,3,2,4], :); % 4*m
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trF = F(1,:) + F(4,:) - 2; % 1*m
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I = repmat([1;0;0;1], 1, m); % 4*m
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P = u(:)' .* (F + FT - 2*I) + l(:)' .* trF .* I;
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end
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