netcdf function is not working and the program keep showing this message

netcdf function is not working and the program keep showing this message ??? Undefined function or method 'netcdf' for input arguments of type 'char'.

[per isakson]

See documentation on netcdf

and check what

    which netcdf -all

returns

[Adam]

Try adding some useful tags to your question if you expect people to provide help.

[hossam mohamed]

i do not know what is tag

[Geoff Hayes]

Hossam - did you follow Per's instructions from the comment above? What was the result of calling which? How are you calling this function? Please copy and paste the commands that you are using that lead to this error message. Also state your version of MATLAB.

[hossam mohamed]

My version of Matlab is 7.10.0 (R2010a) when i copy it , this message showed out

M-files in directory C:\Program Files\MATLAB\R2010a\toolbox\matlab\imagesci\+netcdf

Contents            getAtt              inqDimID            renameDim           
abort               getConstant         inqLibVers          renameVar           
close               getConstantNames    inqVar              setDefaultFormat    
copyAtt             getVar              inqVarID            setFill             
create              inq                 open                sync                
defDim              inqAtt              putAtt              
defVar              inqAttID            putVar              
delAtt              inqAttName          reDef               
endDef              inqDim              renameAtt           

-all not found.

[hossam mohamed]

the command that i am using is (netcdf(file_name);)

[hossam mohamed]

even the command (ncdisp(file_name);) is not working and it is showing this message (??? Undefined function or method 'ncdisp' for input arguments of type 'char'.)

Answer 1

[Mohammad Abouali]

Well, you are using the command wrong.

netcdf(file_name) is not a command.

Note that MATLAB version 2010a was only supporting the kinda one-to-one mapping of (C/FORTRAN) NetCDF api. Recent versions of matlab have other commands that are much easier to read and write a netcdf file. for example ncdisp is not supported in MATLAB 2010a. Neither is ncread.

In that older API you can read a file like this:

% Open the NetCDF file
ncid = netcdf.open('example.nc','NC_NOWRITE');

% returning information from the files:
[ndims,nvars,ngatts,unlimdimid] = netcdf.inq(ncid)

% getting information about a variable
%varid is an integer from 1 to nvars (nvars is the output of previous command.
[varname,xtype,dimids,natts] = netcdf.inqVar(ncid,varid)

% Reading the entire variable
data = netcdf.getVar(ncid,varid)

[hossam mohamed]

Thank you, i will try to install the later version

[hossam mohamed]

After writing these function, how can i show the real data of the netcdf file in matlab

[Mohammad Abouali]

That's whole another question. The variable data is holding the information. Depending on what type it is, what it is, you can plot it different way.