https://de.mathworks.com/help/matlab/ref/netcdf.defvlen.html
netcdf.defVlen - Define user-defined variable length array type (NC_VLEN) - MATLAB
This MATLAB function defines a new NC_VLEN type with the specified type name and base type in the file identified by ncid.
user defined
https://de.mathworks.com/help/matlab/ref/netcdf.inqvlen.html
netcdf.inqVlen - Return information about user-defined NC_VLEN type - MATLAB
This MATLAB function returns information about the user-defined NC_VLEN (variable length array) type.
return informationabout usernetcdf