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writing fixed-length string arrays to netcdf-4 [message #86348]

Tue, 29 October 2013 20:11

Chris O'Dell
Messages: 5
Registered: August 2011

Junior Member

Does anyone know if it is possible to write an array of strings to a variable in a netCDF-4 file as some fixed-length string that has a length > 1? Let me show what I mean, and preface this by saying that I understand HDF-5 better, and in HDf-5 you can definitely do this. I understand that netCDF-4 is built on HDF-5.

Let's define a string array:
stringarr = ['Renee','Tyler','Susan']

METHOD 1 for writing to netcdf file:
(length=1 CHAR array)
------------------------------------
id = NCDF_CREATE('myfile.nc', /CLOBBER, /NETCDF4_FORMAT)
dim1 = NCDF_DIMDEF(id,'dim1',n_elements(stringarr))
len_dim = NCDF_DIMDEF(id, 'string length', max(strlen(stringarr)))
vid = NCDF_VARDEF(id, 'Names', [len_dim, dim1], /CHAR)
NCDF_CONTROL, id, /ENDEF
NCDF_VARPUT, id, vid, stringarr
NCDF_CLOSE, id

This results in a 2D array of CHAR, with dimension (5,3).

METHOD 2 for writing to netcdf file:
(variable-length STRING)
------------------------------------
id = NCDF_CREATE('myfile.nc', /CLOBBER, /NETCDF4_FORMAT)
dim1 = NCDF_DIMDEF(id,'dim1',n_elements(stringarr))
vid = NCDF_VARDEF(id, 'Names', [dim1], /STRING)
NCDF_CONTROL, id, /ENDEF
NCDF_VARPUT, id, vid, stringarr
NCDF_CLOSE, id

This results in a 1D array of variable-length strings, with dimension (3).

What I really want is a 1D array of fixed-length strings, each with length=5 (in this example). Anyone know if this is possible?

Thanks!
Chris

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[Message index]

		writing fixed-length string arrays to netcdf-4 By: Chris O'Dell on Tue, 29 October 2013 20:11
		Re: writing fixed-length string arrays to netcdf-4 By: David Fanning on Tue, 29 October 2013 21:13
		Re: writing fixed-length string arrays to netcdf-4 By: Chris O'Dell on Wed, 30 October 2013 08:49
		Re: writing fixed-length string arrays to netcdf-4 By: David Fanning on Wed, 30 October 2013 09:07
		Re: writing fixed-length string arrays to netcdf-4 By: David Fanning on Mon, 04 November 2013 10:21
		Re: writing fixed-length string arrays to netcdf-4 By: David Fanning on Mon, 04 November 2013 10:48
		Re: writing fixed-length string arrays to netcdf-4 By: David Fanning on Mon, 04 November 2013 11:15
		Re: writing fixed-length string arrays to netcdf-4 By: Chris O'Dell on Tue, 05 November 2013 10:34
		Re: writing fixed-length string arrays to netcdf-4 By: David Fanning on Tue, 05 November 2013 10:50
		Re: writing fixed-length string arrays to netcdf-4 By: Chris O'Dell on Mon, 11 November 2013 16:17

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