根据行号和列号在数组中查找值 [英] find value in array according to the row and column number

问题描述

我有两个矩阵A和B，矩阵A(1，:)= [1 2]的第一行指的是行和列矩阵B(1,2)= 21的数量，现在我想做这项工作适用于矩阵A的另一行而没有循环吗?

I have two matrix A and B,the first row of matrix A(1,:)=[1 2] refer to the number of row and column matrix B(1,2)=21,now I want to do this work for another rows of matrix A without loops?

A=[1 2;2 3;1 3;3 3];
B=[1 21 34;45 65 87;4 55 66];
for i=1:4
d(i,:)=B(A(i,1),A(i,2))
end
d =[21; 87;34;66] 

推荐答案

sub2ind的替代方案是

d = B(A(:,1)+ (A(:,2)-1)*size(B,1));

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