[R-sig-Geo] NetCDF file size

[Michael Sumner]

Please post the code you use to create the file. There are a number of
possibilities for why the file size may not have changed, but frankly
I expect you have just created a file with the original dimensions.

Your description is at least inconsistent in reporting the size here:

> dimension for the data is 240 x 120 x 1460, where 240 is DimX, 120 is DimY
> and 2920 is Time Dimension. I want to take only 4 observations from this

There's no point in us speculating in what your code might be doing
when you could share it with us and we would know exactly.

Cheers, Mike.

On Sat, Jun 18, 2011 at 4:02 AM, Narayani Barve <narayani at ku.edu> wrote:
> Hi All,
>
> I am using ncdf package to manipulate netcdf file downloaded from ECMWF
> website. The downloaded data file contains 8 observations per day for a
> single variable. The size of file is 800+ mb for a whole year data. The
> dimension for the data is 240 x 120 x 1460, where 240 is DimX, 120 is DimY
> and 2920 is Time Dimension. I want to take only 4 observations from this
> file. To do this I wrote a script in R and used ncdf package to manipulate
> the data. My script is working great. And my effective dimension of the
> variable is 240 x 120 x 1460 (which is half of 2920). The only trouble is
> size of the new file is same as old file. In my opinion, the file size
> should have reduced to half. But this is not happening. Is there any
> documentation which tell me more about how the file size is decided, OR Do
> you think I am doing something wrong ? OR is there any way to compact the
> file size like in Microsoft Access, there is a option to compact database ?
>
> Thanks in advance, any help is appreciated.
>
> Narayani Barve
>
> --
> Narayani Barve
> PhD Student,
> Ecology and Evolutionary Biology,
> University of Kansas, KS 66044
>
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>
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-- 
Michael Sumner
Institute for Marine and Antarctic Studies, University of Tasmania
Hobart, Australia
e-mail: mdsumner at gmail.com