matrix , rows , selection , help

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hi !! How from A and B we can found matrix C ¸; This is the big question I write a script but it does not work please help me , thanks ------------------------------------------------------------------------------------------ close all clear all clc A=[3,5,0;2,4,7;8,5,0;514,2

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,21;888,5,11;3,5,0;2,4,7;8,5,0;514,2,21;8,15,111] B=[8,15;54,12;888,5;8,5] A_initial=A; B_initial= B; A=sortrows(A) B=sortrows(B) %B(:,end)=[]; nA=length(A(:,1)); nB=length(B(:,1)); Longueur_ligne=length(A(1,:)) PP=9999999*ones(nB,1); k=1; for i=1:1:nA for j=1:1:nB ligne_A=[A(i,1) A(i,2)]; ligne_B=[B(j,1) B(j,2)]; if ligne_A==ligne_B PP(k)=A(i,Longueur_ligne); k=k+1; end end i; j; end