row ranking among multiple matrices
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mingcheng nie
il 17 Ago 2023
Commentato: mingcheng nie
il 18 Ago 2023
Hi there,
I have three matrix A, B, and C. Here A is a complex matrix of size N*M, where each row of A is generated from the same distribution. Each row of A are also related to corresponding rows of B and C, i.e., the first row will related to the first rows of B and C, so if the row position of A changes, then I want B and C's corresponding rows will be changed as well . Now, calculate the power of each row in A, i.e., the first row power will be: abs(A(1,1))^2+abs(A(1,2))^2+...+abs(A(1,M))^2, then ranking the rows of A based on row's power in descending order, i.e., the highest power row to be the first row, and the lowest poewr row. Meanwhile, I want the rows in B and C can align the ranking changes in A. Is there any efficient way to do this?
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Bruno Luong
il 17 Ago 2023
Modificato: Bruno Luong
il 17 Ago 2023
Just very standard matlab programming
% Generate test data
N=10; M=3;
A=rand(N,M)+1i*rand(N,M);
MB = 1;
MC = 2;
B=randi(10,N,MB)
C=randi(10,N,MC)
p = 2; % power
[Anorm,is] = sort(vecnorm(A,p,2),'descend')
A = A(is,:)
B = B(is,:)
C = C(is,:)
Più risposte (2)
Steven Lord
il 17 Ago 2023
Call sort with two outputs. Use the second output to reorder the other arrays. See the "Sort Vectors in Same Order" example on the sort documentation page; you would need to generalize it to index into matrices rather than vectors, but that's not difficult.
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Jon
il 17 Ago 2023
Modificato: Jon
il 17 Ago 2023
Similar to @Bruno Luong, but since I already coded up example before I saw @Bruno Luong's I will provide it as alternative here
% Make some example data
m = 5;
n = 3;
A = randn(m,n,"like",1+1i)
B = repmat((1:m)',1,m)
C = repmat(10*(1:m)',1,m)
% Calculate power in each row of A
p = sum(abs(A).^2,2)
% Find sort index in descending order
[~,idx] = sort(p,1,'descend');
% Sort the arrays
Asort = A(idx,:)
Bsort = B(idx,:)
Csort = C(idx,:)
2 Commenti
Jon
il 17 Ago 2023
Just made a quick edit on the repmat dimensions so that the example matrices would be a little more obvious
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