Re: [Psidev-ms-dev] PSI-MSS WG Tuesday call reminder

[Stein, S. E. Dr. <ste...@ni...>]

Yes, that is what I had in mind - you get drilled in that when you take a lab course in Chemistry or Physics (maybe it has been dropped in recent years). It is a poor person's way of providing error limits (the lowest significant figure contains the precision of measurement). 

It is true that if only affects 10% of values, but that's enough for me to be concerned. I suppose we could put ASCII in a comment field, but physical quantities do have precisions, and stuffing measured values in those floating formats loses some of it.

Sorry to say, this problem generally affects binary representations of measured values - one reason why I have liked the ASCII nature of XML - and hate to lose it.
 
-Steve

-----Original Message-----
From: Mike Coleman [mailto:tu...@gm...] 
Sent: Thursday, June 11, 2009 4:41 PM
To: Mass spectrometry standard development
Subject: Re: [Psidev-ms-dev] PSI-MSS WG Tuesday call reminder

I took it to mean that with "1", "1.5", "1.50", one gets an implied
level of precision.  That is, "1.5" is generally understood to mean
1.5 +/- 0.05.  If I give you the IEEE float 1.5, much less is implied
about the precision of this value, unless it's explicitly stated
elsewhere.  (If you have a whole set of these, then you probably can
work out the equivalent precision, but this is a bit of a stretch.)

Mike


On Thu, Jun 11, 2009 at 3:23 PM, Angel Pizarro<an...@ma...> wrote:
> Is your question whether we can successfully round-trip the numbers? Eg. go
> from an ascii format to mzML back to originating ascii format and get the
> same exact numbers? I believe that when we pack the numbers and unpack them
> (at least in my non-validating ruby implementations) the numbers and
> significance are completely the same. E.g. 1.005 === 1.005 and not
> 1.005000000000001
> -angel

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