Weird behavior for pagemrdivide matlab 2022b vs 2022a

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I am noticing some strange behaviour when using pagemrdivide. When I run the code below, the Dpage variable contains a lot of NaN, while the Dfor variable computes just fine. I expect these two to be equal, but they are not. Has anyone else encountered this behaviour before?
When I run the same code in matlab 2022a, I don't get this behaviour, it seems to be introduced in 2022b.
F = 300;
D = randn(2,2,F) + 1i*randn(2,2,F);
P = [0 0 1 0
1 0 0 0
0 0 0 1
0 -1 0 0];
P11 = P(1:2,1:2);
P12 = P(1:2,3:4);
P21 = P(3:4,1:2);
P22 = P(3:4,3:4);
Dpage = pagemrdivide(pagemtimes(P11,D) + P12, pagemtimes(P21,D)+P22);
Dfor = zeros(size(D));
for ff = 1 : F
Dfor(:,:,ff) = mrdivide(P11*D(:,:,ff)+P12,P21*D(:,:,ff)+P22);
end
nnz(isnan(Dpage))
ans = 600
nnz(isnan(Dfor))
ans = 0
  13 Comments
Adam
Adam on 17 Jan 2023
I am also still waiting for news about the issue.
They closed my ticket because of the existing internal ticket, but that means there is no information available
Heiko Weichelt
Heiko Weichelt on 19 Jan 2023
EBR is online:
As mentioned before, R2022b Update 4, which will be released in a few days, will contain the fix.

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Answers (1)

Adam Danz
Adam Danz on 18 Jan 2023
Edited: Adam Danz on 18 Jan 2023
Be on the lookout for the next update (update 4) to MATLAB R2022b.
3 Ways to check for MATLAB Updates
  1. From MATLAB Desktop, go to the home tab and select the dropdown menu under Help, then select "Check for Updates".
  2. Look for a red bell in the upper right corner of the desktop (it's gray when there are no available updates). Click it.
  3. Check the manual download page https://www.mathworks.com/downloads/, Select "Get Updates" from the "I WANT TO" dropdown menu.
  10 Comments
Bruno Luong
Bruno Luong on 19 Jan 2023
Edited: Bruno Luong on 19 Jan 2023
Side topic: are you aware of this bug on GPU, log it or have fixed it?
It looks pretty similar to this one. If you need me to fire a bug report I'll happy to do it.
Heiko Weichelt
Heiko Weichelt on 19 Jan 2023
I was not aware of this but GPU code is separate and not my expertise. I'll poke some of my colleagues about it. Thanks.

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