How to save a vector into NetCDF?

General Usage
1

I’m trying to use NCDatasets.jl to create a NetCDF file. I wonder if anyone could show me how to save a vector into a NetCDF variable?

I have a vector D as below:
D = fill(2022,(18,));

Right now, the only way I could make it work is as below:

defDim(ds, "year",  18);
defDim(ds, "col",   1);
v1 = defVar(ds, "year", Int64, ("year", "col"));
v1[:,1] = D;

Basically, I had to create a useless col dimension. How do I do this without defining it? Many thanks

2

The NetCDF format is generally used for data that is dimensional, i.e f(lat, lon) or similar. I’m not sure if it is possible to save just a dimensionless vector to NetCDF. In general when writing NetCDF files I recommend to follow the CF conventions. It might seem a bit long, but they do have some nice conventions and then your files will be easily readable in various software. I recently registered PlateMotionRequests.jl where I have some code to create simple NetCDF files. See the source, in particular write_netcdf which creates the NetCDF dataset from a Table. I don’t know how to write irregular data to NetCDF yet.

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3

Thanks for the reply, and the useful information! I’m able to figure it out myself. Below was how I did it:

defDim(ds, "year",  18);
v1 = defVar(ds, "year", Int64, ("year", ));
v1[:] = D;

The trick is the magic comma. Without it, it won’t work.

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4

aha! thanks forr sharing, good to know that it is possible after all.

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