How to build a matrix from information in multiple matrices

Question

Ernest Adisi 2018-7-30

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412659-how-to-build-a-matrix-from-information-in-multiple-matrices

评论： KSSV 2018-7-30

B00049.txt

I have this file from which I made 2 separate matrices X and y using the 1st and 2nd columns. I now want to create a 3rd matrix from the file. eg find the value from Mat_x(r,c) and Mat_y(r,c) and then scan the txt file to find the resulting value from the row eg. Mat_x(10,10)= 6 Mat_y(10,10)= 6 the the row with x=6 and y=6 give 6.000000 6.000000 0.592404 -6.204762; so Mat_u(10,10) = 0.5924. Can someone show me the way please?

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Answer 1

KSSV 2018-7-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/412659-how-to-build-a-matrix-from-information-in-multiple-matrices#answer_330859

在 MATLAB Online 中打开

A = importdata('B000049.txt') ;
A = A.data ;
x = A(:,1) ; y = A(:,2) ;
u = A(:,3) ; v = A(:,4) ;
xi = unique(x) ; yi = unique(y) ;
[X,Y] = meshgrid(xi,yi) ;
U = reshape(u,size(X)) ;
V = reshape(v,size(X)) ;