NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Sorry, I have forgotten to send my answers to the netcdf group. My comments are in the e-mail below, after your answers. Thanks for your help ! Regards, Gérald De : Gérald Mercadier Envoyé : mercredi 17 juillet 2013 12:20 À : 'David W. Pierce' Objet : RE: [netcdfgroup] Compound type and Fortran90 Thank you for your answer Dave ! Please see my questions/remarks in your e-mail and thank you in advance for your help. Regards, Gérald De : davidwilliampierce@xxxxxxxxx<mailto:davidwilliampierce@xxxxxxxxx> [mailto:davidwilliampierce@xxxxxxxxx] De la part de David W. Pierce Envoyé : mardi 16 juillet 2013 20:01 À : Gérald Mercadier Cc : netcdfgroup@xxxxxxxxxxxxxxxx<mailto:netcdfgroup@xxxxxxxxxxxxxxxx> Objet : Re: [netcdfgroup] Compound type and Fortran90 Hi Gerald, When the documentation says that the data to be written "may be of any type", it means, any fortran90 native type (real, double precision, integer, etc.) The netcdf library does not know how to write out a derived type that you create yourself. è (Gérald) In the documentation about compound types (see http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-f90/Compound-Types.html#Compound-Types), on can read "To write data in a compound type, first use nf90_def_compound to create the type, multiple calls to nf90_insert_compound to add to the compound type, and then write data with the appropriate nf90_put_var1, nf90_put_vara, nf90_put_vars, or nf90_put_varm call." I know how to define compound types in netCDF but I don't understand how to write data in a compound type as described in the doc. è But you confirm me that one cannot write in a compound type, using netCDF functions in Fortran90. In this case, the documentation is not correct. Is an evolution planned to make the user defined type supported by the writing function ? My personal advice is that you will save yourself headaches down the line, and your netcdf files will be more widely compatible with the world of software already out there, if you avoid netcdf compound types. Some problems really mandate a compound type, so it's great that they are available, but it's just limiting the usefulness of your files if you use compound types gratuitously. I.e., if you're writing a velocity field, just write U and V fields rather than making a compound type that has U and V components. è (Gérald) Is it possible to manage compound types in C language ? (define/write/read ?) Your remark about the compound types is a general remark ? I mean not only for Fortran90 using ? In a general way and whatever the programming language, what are the recommendations on this matter ? The compound type should be avoided ? what is the technical status ? (particular convention ? portability problems ? programming difficulty when using it ?) è I don't know very well netCDF but do you recommend to use the lib in C or in Fortran90 ? What would be the limitations/constraints in a Fortran90 using ? If you do absolutely need compound types, the solution would be to write your own version of nf90_put_var() that would take as the argument your derived type and write it appropriately into a netcdf compound type using lower level calls. Regards, --Dave On Tue, Jul 16, 2013 at 10:14 AM, Gérald Mercadier <Gerald.mercadier@xxxxxxxxxxx<mailto:Gerald.mercadier@xxxxxxxxxxx>> wrote: Dear all, I am using netCDF 4.1.3 in a Fortran90 code which is compiled with gfortran 4.4.5. I want to use the compound types. I have no problem to define a compound type, but I am currently encountering a problem when I try to put values into a well-defined compound type. The problem occurs at the compilation, when using nf90_put_var. The compilation fails with the error "Error: There is no specific function for the generic 'nf90_put_var' at (1)" In my code, I have defined a compound type using nf90_def_compound and nf90_insert_compound. This type contains variables of int/double/string type or another user defined type. The definition works well, the .nc file created is correct. Unfortunately, the call of nf90_put_var leads to this compilation error. The third argument of the routine is "values", which is the derived type (or Fortran90 structure) in my case, containing variables of different types. The documentation of nf90_put_var (see http://www.unidata.ucar.edu/software/netcdf/docs/netcdf-f90/NF90_005fPUT_005fVAR.html#NF90_005fPUT_005fVAR) says that "the data may be of any type, and may be a scalar or an array of any rank". I just call nf90_put_var with 3 arguments, like this "nf90_put_var(ncid, varid, values)". I would like to know how put a value of a derived type variable into a compound type variable with netCDF, in a Fortran90 code. Can someone help me please ? Thank you for your help ! 153, rue du Lac<http://www.noveltis.com/> F-31670 LABEGE<http://www.noveltis.com/> Tel : +33 (0)5.62.88.11.28<http://www.noveltis.com/> Fax : +33 (0)5.62.88.11.12<http://www.noveltis.com/> www.noveltis.com<http://www.noveltis.com/> <http://www.noveltis.com/> <http://www.noveltis.com/> Merci de considérer toutes les informations contenues dans cet email comme confidentielles. Vous ne devez pas les transmettre sans autorisation. Si ce mail ne vous est pas destiné, merci de le signaler à l'expéditeur et de l'effacer de votre système. <http://www.noveltis.com/> Please, consider email information as confidential. Do not transfer without prior authorization. If this email is not intended for you, thank you to notify the sender and to delete this message from your computer.<http://www.noveltis.com/> <http://www.noveltis.com/> Agissons au quotidien pour préserver notre environnement. N'imprimez ce courrier et les documents joints que si nécessaire.<http://www.noveltis.com/> <http://www.noveltis.com/> _______________________________________________ netcdfgroup mailing list netcdfgroup@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/ <http://www.noveltis.com/> -- David W. Pierce Division of Climate, Atmospheric Science, and Physical Oceanography Scripps Institution of Oceanography, La Jolla, California, USA (858) 534-8276 (voice) / (858) 534-8561 (fax) dpierce@xxxxxxxx<http://www.noveltis.com/>
netcdfgroup archives: