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Topic: Compile function and AppendTo for lists (vrs. 8.0.4)
Replies: 8   Last Post: Feb 1, 2012 3:50 AM

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Patrick Scheibe

Posts: 327
Registered: 5/22/07
Re: Compile function and AppendTo for lists (vrs. 8.0.4)
Posted: Jan 31, 2012 5:43 AM
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Hi Fred,

some short notes:


> appendBag2a = Compile[{{k, _Integer, 0}}, Module[{p = Bag[Most[{0}]]},
> Do[StuffBag[p, Bag[{1, i}]], {i, 1, k}];
> Table[BagPart[BagPart[p, i], All], {i, 1, k}]]];
>
> That works fine and fast,


But look that your type p is clearly wrong. p is a bag of bags of
Integer and has to be initialized with

Internal`Bag[Most[{Internal`Bag[{1}]}]]

We can only guess about the reasons why it works anyway. If it is
implemented with pointers, than it seems the integers of your p-Bag are
used to store the pointers.

> The problem seems to be the initialization of the
> locale variable p. I tried compilation with the definitions p=Bag[],
> p=Bag[{}], p=Bag[Rest[{0}]], p=Bag[Rest[{{0,0}}]], or e.g.


Now you know how.

Cheers
Patrick





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