Re: [Open-ms-general] msconvert parameters

[wenbo <wen...@gm...>]

Hi Hannes:
Thank you for your prompt and exact answer. I got it now.
Best regards!
Bo


On Sun, May 25, 2014 at 6:23 PM, Hannes Röst <han...@gm...> wrote:

> Hi Bo
>
> If this is about msconvert.exe, probably the proteowizard mailing list
> would have more knowledgeable people on it. However, from what I can
> see, these options relate to the precision in which the data is stored
> - e.g. whether 32 or 64 bits are used to store the information. If 64
> bits are used, you will use up somewhat more diskspace. Internally,
> OpenMS uses 32 bit precision for intensity and 64 for mz, so this
> might not be a bad choice to also store the data in that format, e.g.
> I would recommend for you to use -mz64 and -inten32
>
> More theoretical: According to IEEE 754 there are usually 23 bits used
> for 32 bit floating point numbers which lead to a precision of about 7
> decimal places which is in the range of sub-ppm. Therefore, for mz
> values it could have a slight effect but probably still less than the
> instrument precision.
>
> Hannes
>
>
>
> On 25 May 2014 05:47, wenbo <wen...@gm...> wrote:
> > Hi,
> > Does anyone know the difference of  the following parameters from
> msconvert?
> > What's their impact to OpenMS workflow? And usually how to set?
> >   --64                     : set default binary encoding to 64-bit
> precision
> >                            [default]
> >   --32                     : set default binary encoding to 32-bit
> precision
> >   --mz64                   : encode m/z values in 64-bit precision
> [default]
> >   --mz32                   : encode m/z values in 32-bit precision
> >   --inten64                : encode intensity values in 64-bit precision
> >   --inten32                : encode intensity values in 32-bit precision
> >
> > Many thanks and best regards!
> > Bo
> >
> >
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