finding in which row two array has equal values

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Oxeley
Oxeley 2019-4-17
编辑： Oxeley 2019-4-17
I have two array with different length A=(500.000,1) and B=(621,1) where all the 621 values of B are included in some of the A rows.
I want to find in which row of A, B will have the same value of A and create a new array C with the result(index)
any idea?

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Adam Danz
Adam Danz 2019-4-17
编辑：Adam Danz 2019-4-17
% Create fake data for the example
B = 1:621;
A = randi(621, 500000, 1);
% Loop through each element of B, return the row number of matching values in A
resultIdx = cell(size(B));
for i = 1:length(B)
resultIdx{i} = find(ismember(A,B(i)));
end
resultIdx{n} lists the rows of A that match the value of B(n).
  1 个评论
Oxeley
Oxeley 2019-4-17
编辑：Oxeley 2019-4-17
fantastic....ismember() it's could be the instruction that i've searched for a day .
thanks

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