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From: Patrick Scheibe on 17 Sep 2009 06:20
Hi,

can someone confirm the following:

In[12]:= Table[j, {j, 0.1, 0.3, 0.1}]
Out[12]= {0.1, 0.2, 0.3}

as expected. But

In[13]:= ParallelTable[j, {j, 0.1, 0.3, 0.1}]
Out[13]= {0.1, 0.2}

and it seems to be restricted to the first range spec since

In[14]:= ParallelTable[{i, j}, {j, 0.1, 0.3, 0.1}, {i, 0.1, 0.3, 0.1}]
Out[14]= {{{0.1, 0.1}, {0.2, 0.1}, {0.3, 0.1}}, {{0.1, 0.2}, {0.2,
0.2}, {0.3, 0.2}}}

This is so fundamental that I'm very certain someone else must have
been stumbled
over this before me. I tested this on

Mac OS X 10.6 Snow Leopard with Mathematica 7.0.1 (2 ParallelKernels)

and

Mac OS X 10.5.7 Leopard with Mathematica 7.0.1 (8 ParallelKernels but only 4
used for this)

Cheers
Patrick



From: Syd Geraghty on 18 Sep 2009 05:37
Patrick,

I confirm your results on my system below.

Looks like a bug (at least a change of limit test behaviour).

ParallelTable[{i, j}, {j, 0.1, 0.31, 0.1}, {i, 0.1, 0.3, 0.1}]

correctly gives ...

{{{0.1, 0.1}, {0.2, 0.1}, {0.3, 0.1}}, {{0.1, 0.2}, {0.2, 0.2}, {0.3,
0.2}}, {{0.1, 0.3}, {0.2, 0.3}, {0.3, 0.3}}}


Cheers ... Syd

PS I have just reported this to Wolfram support.


Syd Geraghty B.Sc, M.Sc.

sydgeraghty(a)mac.com

Mathematica 7.0.1 for Mac OS X x86 (64 - bit) (18th February 2009)
MacOS X V 10.6 Snow LeopardMacBook Pro 2.33 GHz Intel Core 2 Duo 2GB
RAM




On Sep 17, 2009, at 3:21 AM, Patrick Scheibe wrote:

> Hi,
>
> can someone confirm the following:
>
> In[12]:= Table[j, {j, 0.1, 0.3, 0.1}]
> Out[12]= {0.1, 0.2, 0.3}
>
> as expected. But
>
> In[13]:= ParallelTable[j, {j, 0.1, 0.3, 0.1}]
> Out[13]= {0.1, 0.2}
>
> and it seems to be restricted to the first range spec since
>
> In[14]:= ParallelTable[{i, j}, {j, 0.1, 0.3, 0.1}, {i, 0.1, 0.3, 0.1}]
> Out[14]= {{{0.1, 0.1}, {0.2, 0.1}, {0.3, 0.1}}, {{0.1, 0.2}, {0.2,
> 0.2}, {0.3, 0.2}}}
>
> This is so fundamental that I'm very certain someone else must have
> been stumbled
> over this before me. I tested this on
>
> Mac OS X 10.6 Snow Leopard with Mathematica 7.0.1 (2 ParallelKernels)
>
> and
>
> Mac OS X 10.5.7 Leopard with Mathematica 7.0.1 (8 ParallelKernels
> but only 4
> used for this)
>
> Cheers
> Patrick
>
>
>
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