Hello, I will try to answer as best I can; I am not a fortran programmer, however, but hopefully that won't matter. 1. The input for NF90_GET_VAR is in fact the file ID number -or- the group ID number (when dealing with netCDF 4 files). 2. I'm glad you were able to get the information about compound files working. If this were C code, you would use nc_get_var() to read the values of the compound variable type into an array of structs, which you would then inspect one at a time. You could also use nc_get_var1() to read in a single element from the compound type data, but you would still have to inspect the components of the data type individually. nc_get_var(), which is invoked by NF90_get_var, returns the entire compound variable in a struct, and does not provide direct access to the individual components. I'm sorry I can't provide any information in a Fortran context; hopefully this information is useful. -Ward > > > Dear Ward > > Your recommendation sounds good. However, the user > guide is not clear about what is really required BEFORE using the > function NF90_GET_VAR. > > I can read and display every piece of > information on my test nc file, incluing the cases when variables are > compound user defined types with several fields, each field with a > different type, inside a group, which may exist inside other groups. I > am attaching a text file showing that I can extract information about > every single variable of any type and dimension, on the root group (what > I name level 1 group on my attached output file) or on other groups of > level 2 or deeper. > > The user guide does not explain HOW the information > of compound user type, namely the information on the respective fields, > should be made available to the funtion NF90_GET_VAR. > > Indeed, the user > guide says that the INPUT to that function is > > (1) the file ID number > (I suspect it should be the groupd ID number, not the file ID number...) > > > (2) the variable ID number, as provided by a previous call to the > function NF90_INQ_VARID, which requires as input the file ID (I suspect > it should also be the group ID...) and the variable name > > Thus I am > somehow lost, because I do not know HOW the function NF90_GET_VAR has > information about the names, types, sizes of the fields to be read. > > It > requires the variable ID only. > > Shoud I work with the function > NF90_GET_VAR for every single field each time, NOT to the whole compound > type variable? If so, then the variable ID should be the field ID... > > I > would appreciate the kindness of your attention and help, particularly > for clarification of the previous item, > > Kind regards > > Arlindo Arriaga > > > PS: the variable I want to read has has the name "sst" and it is > composed by two fields, each field is a real with 4 bytes. > > Such a > structure is allocated with the dimension 4320. I represent that > variable in F90 as follows: > > TYPE binDataType > real(kind=4) :: sum > > real(kind=4) :: sum_squared > end type binDataType > TYPE(binDataType), > allocatable, dimension(:) :: sst_data > > > +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > On > Thu, 14 Apr 2016 10:20:38 -0600, Unidata netCDF Support wrote: > > > > Hello, > > > > In order to read data stored in a compound type, you must > use `NF90_INQ_COMPOUND` to learn about the compound data structure. The > user guide for netCDF-Fortran NF90 may be found here: > > > > * > http://www.unidata.ucar.edu/software/netcdf/documentation/historic/netcdf-f90/Compound-Types.html#Compound-Types > I hope this helps, > > > > -Ward > > > >> Dear Lady or Sir I would > appreciate if you could tell me how to read data from nc files with > netCDF-4 format using F90. The Fortran library function NF90_GET_VAR > works well with integer or real arrays, but it can not compile if I want > to read a compound user defined type variable (as for example, sst on a > MODIS nc file with netcdf-4 format). Please let me know what may your > services suggest as an alternative to that F90 library function ? I > thank you for the kindness of your attention. Kind regards Arlindo > Arriaga, PhD Meteorology UW-Madison 1991 > > > > Ticket Details > > > =================== > > Ticket ID: QYC-628947 > > Department: Support > netCDF > > Priority: Normal > > Status: Closed > > > > Links: > ------ >  > http://www.unidata.ucar.edu/software/netcdf/documentation/historic/netcdf-f90/Compound-Types.html#Compound-Types > > Ticket Details =================== Ticket ID: QYC-628947 Department: Support netCDF Priority: Normal Status: Closed
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