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15 lines
380 B
15 lines
380 B
%--------------------------
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% @Author: Jingqiao Hu
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% @Date: 2021-05-18 22:01:15
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% @LastEditTime: 2021-05-18 22:04:01
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%--------------------------
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function P = PK1_fast_nonlinear(u, l, F)
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Fdet = det_3rank(F); % 1,m
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JJ = log(Fdet);
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Finv = inv_3rank(F); % 9,m
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FinvT = Finv([1:3:9, 2:3:9, 3:3:9], :);
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P = u(:)' .* (F - FinvT) + l(:)' .* JJ .* FinvT;
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end
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