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Bug introduced in 10.0 and fixed in 11.1

On Windows 10, 64 bit, version 11.0.1, my kernel just started crashing for no reason as for as I can see. Does/should the following crash your kernel?

sparse = SparseArray[ArrayRules[RandomInteger[{1, 10}, 20] // N]];
Fold[Partition, sparse, {2, 5}]

It crashes only when the sparse array is all nonzero (nonsparse), and when the entries are not _Integer, and when the sparse array is created by rules. I use the workaround Fold[Partition, Normal@sparse, {2, 5}], but I don't think Normal should need be there.

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  • $\begingroup$ Crashes for me as well (same system configuration). $\endgroup$ Commented Feb 2, 2017 at 19:31
  • $\begingroup$ Crashed for me too (v11.0.1 on macOS Sierra). Good way to reset the In[]:= numbers, though ;-) $\endgroup$ Commented Feb 2, 2017 at 21:09
  • $\begingroup$ It's definitely not Fold: doing sp1 = Partition[sparse, 2]; Partition[sp1, 5] crashes the kernel for me (Mac OSX 10.5, M V10.0.1), but sp1 = Partition[sparse, 2] // Normal; Partition[sp1, 5] doesn't. So Partitioning the two-index SparseArray here is a problem. $\endgroup$ Commented Feb 2, 2017 at 21:12
  • $\begingroup$ But this works fine?! mat = N@RandomInteger[{1, 10}, {10, 2}]; Partition[SparseArray@mat, 5] $\endgroup$ Commented Feb 2, 2017 at 21:16
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    $\begingroup$ reported it. It's the second partition that does it. $\endgroup$ Commented Feb 3, 2017 at 2:04

1 Answer 1

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This bug has been fixed in the just released Mathematica 11.1.

sparse = 
  SparseArray[ArrayRules[RandomInteger[{1, 10}, 20] // N]];
Fold[Partition, sparse, {2, 5}] // Head

(* SparseArray *)
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