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<h1>#55350: exp() suffers from low precision</h1>
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pmichaud
<pmichaud [at] pobox.com>
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<a name="txn-420092" href="/rt3/Ticket/Display.html?id=55350#txn-420092">#</a>
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<td class="date">Thu Jun 05 10:54:28 2008</td>
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moritz <!-- x --> at verplant.org - Ticket created
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<td align="right" class="message-header-key">Subject:</td>
<td class="message-header-value">exp() suffers from low precision</td>
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<td align="right" class="message-header-key">Date:</td>
<td class="message-header-value">Thu, 05 Jun 2008 20:12:16 +0200</td>
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<td class="message-header-value">rakudobug <!-- x --> at perl.org</td>
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<td align="right" class="message-header-key">From:</td>
<td class="message-header-value">Moritz Lenz <moritz <!-- x --> at verplant.org></td>
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<div class="message-stanza-depth-0">
Rakudo as of r28105 suffers from low precision in its exp() function.<br />
rakudo:<br />
<br />
<div class="message-stanza-depth-1">
> say exp(5) - 148.4131591025766<br />
</div>
0.000159103<br />
<br />
perl -wle 'print exp(5) - 148.4131591025766'<br />
0<br />
<br />
Mathematica agrees with perl 5:<br />
In[1] := N[Exp[5], 20]<br />
Out[1] = 148.41315910257660342<br />
<br />
This makes one test fail in t/spec/S29-num/exp.t<br />
<br />
I don't know if that's a parrot or a rakudo bug, so please forward if<br />
necessary.<br />
<br />
-- <br />
Moritz Lenz<br />
http://moritz.faui2k3.org/ | http://perl-6.de/<br />
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<a name="txn-420116" href="/rt3/Ticket/Display.html?id=55350#txn-420116">#</a>
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<td class="date">Thu Jun 05 11:22:54 2008</td>
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pmichaud - Comments added
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Fixed in r28106, thanks!<br />
<br />
Pm<br />
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<a name="txn-420118" href="/rt3/Ticket/Display.html?id=55350#txn-420118">#</a>
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<td class="date">Thu Jun 05 11:22:55 2008</td>
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pmichaud - Status changed from 'new' to 'resolved'
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<a name="txn-420122" href="/rt3/Ticket/Display.html?id=55350#txn-420122">#</a>
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<td class="date">Thu Jun 05 11:23:50 2008</td>
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pmichaud - Taken
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<a name="txn-420228" href="/rt3/Ticket/Display.html?id=55350#txn-420228">#</a>
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<td class="date">Thu Jun 05 13:06:10 2008</td>
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pmichaud - Correspondence added
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<td align="right" class="message-header-key">Subject:</td>
<td class="message-header-value">Re: [perl #55350] exp() suffers from low precision</td>
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<td align="right" class="message-header-key">Date:</td>
<td class="message-header-value">Thu, 5 Jun 2008 15:05:44 -0500</td>
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<td class="message-header-value">perl6-compiler <!-- x --> at perl.org</td>
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<td align="right" class="message-header-key">From:</td>
<td class="message-header-value">"Patrick R. Michaud" <pmichaud <!-- x --> at pobox.com></td>
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On Thu, Jun 05, 2008 at 10:54:28AM -0700, Moritz Lenz wrote:<br />
<div class="message-stanza-depth-1">
> Rakudo as of r28105 suffers from low precision in its exp() function.<br />
> rakudo:<br />
> <br />
<div class="message-stanza-depth-2">
> > say exp(5) - 148.4131591025766<br />
</div>
> 0.000159103<br />
</div>
<br />
Actually, the problem was low precision in the<br />
148.4131591025766 constant, which Parrot was<br />
truncating to 148.413 in the PIR source. Now <br />
fixed in r28106.<br />
<br />
Pm<br />
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