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7 votes
Accepted

Help understanding a bug when FoldList using RandomChoice is Compiled

Here' s a simpler example that demonstrates the same issue: ...
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2 votes

Output of code generated by CellPrint goes to the end of notebook

I reproduce this behavior with versions 5.2, 8.0.4, 12.3.1 and 13.0.1 on Win10 x64. I would count this as a long-standing FrontEnd bug. An extended example: ...
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2 votes

Problem with a DAE and DiscreteVariables

One can keep differentiating until the DAE turns into an ODE: ...
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  • 216k
3 votes

ComplexExpand no longer assumes Derivative[__][__][__] as real

Here another workaround that may be safe (as it would likely affect only expressions containing u'): ...
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4 votes

ComplexExpand no longer assumes Derivative[__][__][__] as real

Comments have identified this as a bug; in the meantime, a simple way to bring back the old behavior for ComplexExpand in a given session can be obtained by adding ...
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  • 8,208
0 votes

Strange behaviour in GeometricTransformation

I have an answer from Technical Support. "ReflectionTransform is not behaving properly" - Suggest that if the community agrees that this is posted as a bug.
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6 votes

Constructing a RootSum object changes existing internal syntax

Another workaround is not to put the single Function variable in a list. ...
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6 votes
Accepted

Constructing a RootSum object changes existing internal syntax

The bug does not exist for Slot[1], just for Function with named parameters. (A dummy variable is substituted for ...
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  • 216k
0 votes
Accepted

An unclear Mathematica result for Borel summation

My explanation, but not a justification, of the Mathematica result is as follows. ...
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  • 17.1k
3 votes
Accepted

Problem with a DAE and DiscreteVariables

As stated in the question, a[t] does not behave properly for the code in the question, which probably is a bug. Circumventing this problem can be accomplished with <...
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  • 58.4k
1 vote

Why do I see Part::partw error when using NDSolveValue?

This was a bug that's fixed in V13.0 (or earlier).
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  • 36.1k
4 votes

Surface integral with ImplicitRegion not working as expected?

This is a bug. Integrate[z, {x, y, z} ∈ DiscretizeRegion[myReg2, MaxCellMeasure -> .01]] -25.0531
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4 votes
Accepted

Surface integral with ImplicitRegion not working as expected?

This is a bug, but just wanted to post an answer to share what I found. Maybe it'll help someone at Wolfram figure out what's up. Here's a plot of the region with the $z = 0$ plane shown. Weird ...
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