Sorting and averaging matrices

2 次查看（过去 30 天）
HT
HT 2019-9-9
评论： Matt J 2019-9-16
  1. I have two matrices. One for example is A = 520 x 1 and it has numbers from 1-8 which are not in order. For every number in this matrix, I have corresponding 1000 samples in another matrix B 520 x 1000. I want to first sort A and arrange numbers from 1-8 for every 8 rows. So output should be (1,2,3,4,5,6,7,8,1,2,3,4,5 and so on) and arrange corresponding values in B also such that they match.
  2. Once this is done, I want to average every 5 rows of B and store it in a new matrix which will be 104 x 1000.
Thanks for the help in advance!
  4 个评论
显示 2更早的评论
Guillaume
Guillaume 2019-9-9
100 is not a multiple of 8. Isn't that a problem? Why average every 5 rows when you have groups of size 8?
HT
HT 2019-9-9
It will be a multiple of 8 always. I just took 100 as a random number. I will edit the main question, thank you.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Matt J
Matt J 2019-9-9
编辑：Matt J 2019-9-10
[~,idx]=sort( reshape(A,8,[]) ,1);
[m,n]=size(idx);
C=reshape(B,m,n,[]);
[m,n,p]=size(C);
idx=idx+(0:n-1)*m+reshape(0:p-1,1,1,p)*(m*n);
C=mean(reshape(C(idx),5,[]));
result=reshape( C ,m*n/5,[]);
  8 个评论
显示 6更早的评论
HT
HT 2019-9-16
How can I save sorted A values in a variable?
Matt J
Matt J 2019-9-16
[Asorted,idx]=sort( reshape(A,8,[]) ,1);

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 Shifting and Sorting Matrices 的更多信息

标签

产品

Community Treasure Hunt

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

Start Hunting!

Translated by