Rearrange an array based on a matrix

1 次查看（过去 30 天）
luca
luca 2019-10-3
评论： luca 2019-10-3
Given the following arrays
V= [4,2,4,2,1,1,4,2,1,2,6,2,2,4,6,1,2,6,2,2,2,6,8,8,7,7,8,7,7,7,7,8,7,7,6,6,9,9,9,8,8,8,9,8,9,8,9,8,9]
I want to randomly mix the vector but following a rule
In fact, given a matrix
M = [1 6 7 9;
2 0 8 0;
4 0 0 0]
I want to randomly mix the values in V that are in the same column of M mainting the same position in V. It means that a place take by 1 can be randomly substituted by a 2 or a 4. It's important that the position inside the array V doesn't change, what has to change is just the value. For what concerne 6, in this case we have only 6, so it will be the same. For what concerne 7 and 8, they will randomly mix inside the array V exchange their value but mantain the same position (same column index).
making an example with a shorter vector
V = [6 7 6 1 2 4 9 9 9 6 7 4 7 1]
I would like to obtain a random array like
V = [6 8 6 4 1 4 9 9 9 6 7 4 8 2]
for example in the fourth column we had a 1, with the random permutation I want to randomly subsituted 1 with 1,2 or 4 (based on M column).
I hope the request is clear.
May someone help me with this task?

请先登录，再回答此问题。

采纳的回答

meghannmarie
meghannmarie 2019-10-3
Would something like this work:
for i = 1:numel(V)
[~,k] = find(M == V(i));
col_v = M(:,k);
col_v = col_v(col_v ~= 0);
ridx = randi(numel(col));
V(i) = col(ridx);
end
  3 个评论
显示 1更早的评论
luca
luca 2019-10-3
My mistake! Sorry and thanks. Again

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

产品


版本

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by