| Re: [eigen] a couple of RFCs |
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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] a couple of RFCs
- From: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>
- Date: Wed, 12 Aug 2009 22:40:30 -0400
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2009/8/12 Thomas Capricelli <orzel@xxxxxxxxxxxxxxx>:
>> to work. I suggest that the default value for "precision" be -1, and
>> that this special value means "use the current precision of the
>> stream".
>
> I'm not sure I understand everything, but if the stream already has a
> 'precision', why does eigen add another one ?
Indeed, we agree that by default we should use the stream precision.
But it's still useful to leave the possibility to specify a different
precision as part of the IOFormat. For example an app could use one
IOFormat with precision=5 for debug output, and another IOFormat with
precision=16 for saving matrices to files. It would be annoying and
slippery for the user to have to specify the precision separately
everytime.
> Anyway i'm all for outputting
> double/float with LOTs of decimals by default, or at least that it is easy to
> do so.
By default, we'll use the stream's precision, I don't know if the c++
standard says anything about their own default precision, but if you
want full precision you can always to: mystream.precision(16);
Cheers,
Benoit