How to abort or stop this (accidently large defined) SparseArray production?
s = N[SparseArray[Table[{2^i, 4} -> i, {i, 30}]]]
Alt+. or Alt+, seem to give up. Even your Windows task manager is struggling.
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asked Jan 13, 2013 at 16:39
1 Answer
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Could use $Pre to wrap things in MemoryConstrained. I'll illustrate with an unusually tight constraint.
SetAttributes[memcon, HoldAll]
memcon[new_] := MemoryConstrained[new, 10^4]
$Pre = memcon;
Examples:
ByteCount[Range[10^6]]
(* Out[4]= $Aborted *)
s = N[SparseArray[Table[{2^i, 4} -> i, {i, 20}]]]
(* Out[5]= $Aborted *)
answered Jan 13, 2013 at 20:56
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3$\begingroup$ If you don't preclude the use of
$Preas I did in my earlier question this is an excellent method. I recommend it to anyone using version 7 or earlier. Belisarius gives a nice method for v8+ in the linked thread that does not tie up$Pre. $\endgroup$ Commented Jan 14, 2013 at 1:14 -
$\begingroup$ Another question would be: why does this fill up the memory at all? The array is very sparse with only a few elements. Is there a limit on the size of
SparseArrays that's exceeded here? $\endgroup$– SzabolcsCommented Jan 29, 2013 at 22:25 -
$\begingroup$ @Szabolcs
InputForm[SparseArray[Table[{2^i, 4} -> i, {i, 5}]]]seems to show a dense 1-d listwith the jth element indicating how many nontrivial elements have been seen prior to row j. That at least is my guess. $\endgroup$ Commented Jan 29, 2013 at 22:42
Evaluation->Quit Kernel -> Localoften succeeds whereAbort Evaluationfails for me. $\endgroup$