Wrong results with cumsum on logical tall array?

2017 11 30
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更新时间：2017 11 30
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Hello,
I use Matlab 2017b since a few weeks and try to handle big data with tall Arrays. Today i had to find out that cumsum doesn't work properly on (logical) tall Arrays. Still didn't tested it on other tall Arrays than logical. The first pictures shows a Logical Array as tall and as usual logical plotted.
The next picture Shows the cumsum.
As you can see the cumsum on common Logical Array works as expected. The tall doesn't.
I saw this first on a machine with parallel computing Toolbox installed, but it also appears without the Toolbox. How to explain this phenomenon?
Best regards

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Edric Ellis
Edric Ellis 2017-11-30
编辑：Edric Ellis 2017-11-30

1 个投票

Thanks for reporting this - this is indeed a bug in the tall implementation of cumsum for logical arrays. You can work around this by using
cumsum(double(tallLogicalArray));
This is described in the following bug report: https://www.mathworks.com/support/bugreports/1635821.

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