Re: [Pytables-users] compression in 0.9

[Francesc A. <fa...@py...>]

A Dimecres 10 Novembre 2004 14:23, Jeff Whitaker va escriure:
> Francesc:  That new version of _calcbuffersize fixed the problem -  
> compression ratios with the 'medium' value of bufmultfactor are back to 
> what they were in 0.8.1.  Changing to any of the other values has very 
> little effect on file size.  Thanks for your prompt attention to this 
> problem!

Good. The patch has been uploaded to the Release-0.9_patches branch in CVS.
It will hopefully appear in next 0.9.1 release.

> BTW:  I've added a couple more command line options to nctoh5 - the new 
> version is at http://whitaker.homeunix.org/~jeff/nctoh5.  The new 
> switches are:
> 
>  --unpackshort=(0|1) -- unpack short integer variables to float variables
>      using scale_factor and add_offset netCDF variable attributes
>      (not active by default).
>  --quantize=(0|1) -- quantize data to improve compression using
>      least_significant_digit netCDF variable attribute (not active by 
> default).
>      See http://www.cdc.noaa.gov/cdc/conventions/cdc_netcdf_standard.shtml
>      for further explanation of what this attribute means.

Great!, however I can't get the file. Is the above URL correct?

Cheers,

-- 
Francesc Altet