h5writemode
===========
```{function} h5writemode(filename, x, y, Vx, Vy)
```
Full definition:
```{code-block} matlab
h5writemode(filename, x, y, Vx, Vy)
```

Write a 2-D mode field profile to an HDF5 file for use with
AddWaveGuidePort ('E_WG_file' / 'H_WG_file').

Parameters
----------
  filename : output file path (overwritten if it exists)
  x, y     : coordinate vectors of length nx and ny
  Vx, Vy   : field component matrices (nx-by-ny), where
             Vx(i,j) is the field value at coordinate (x(i), y(j))

HDF5 layout written:
  /x   1-D dataset, length nx
  /y   1-D dataset, length ny
  /Vx  2-D dataset, shape nx x ny
  /Vy  2-D dataset, shape nx x ny
  root attribute Version = 1.0

On Octave the oct-file h5writemode_octave (compiled by setup.m) is used.
On Matlab  the built-in h5create / h5write / h5writeatt are used.

See also AddWaveGuidePort, setup