How to perform inverse between a page of a 3D matrix and a column vector without loops?

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Kalasagarreddi Kottakota
回答： Steven Lord 2023-1-11
The matrix H looks like 9 x 2 x 14 and matrix A1 is 9 x1. I need to perform inversion between every page of H with A using mldivide so that output looks like 2 x 1 x14 matrix. No loops.
clear all;
close all;
load H.mat
load A1.mat

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采纳的回答

Steven Lord
Steven Lord 2023-1-11
Why do you insist to do this without looping? If you have been told "for loops in MATLAB are slow" that is not necessarily the truth anymore.
But in this particular case it is possible to use pagemldivide to accomplish this task.

更多回答（1 个）

Kevin Holly
Kevin Holly 2023-1-11
编辑：Kevin Holly 2023-1-11
Ran in:
load H.mat
load A1.mat
size(H)
ans = 1×3
9 2 14
size(A1)
ans = 1×2
9 1
answer = H.\A1;
size(answer)
ans = 1×3
9 2 14
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Kevin Holly
Kevin Holly 2023-1-11
Ran in:
Ah, I see. I misread the output. So, you need to vectorize this:
load H.mat
load A1.mat
size(H)
ans = 1×3
9 2 14
size(A1)
ans = 1×2
9 1
for ii = 1:size(H,3)
answer(:,:,ii) =H(:,:,ii)\A1;
end
size(answer)
ans = 1×3
2 1 14

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