plFree2dGrid: Free the memory associated with a PLFLT matrix allocated using plAlloc2dGrid

`plFree2dGrid`: Free the memory associated with a PLFLT matrix allocated using `plAlloc2dGrid`
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#### `plFree2dGrid`: Free the memory associated with a PLFLT matrix allocated using `plAlloc2dGrid`

`plFree2dGrid (` | f,
| nx,
| ny`)`;

Frees a block of memory allocated using `plAlloc2dGrid`.

`f` (``PLFLT_NC_MATRIX``, input)

  A matrix to be freed after allocation by `plAlloc2dGrid` and all use of the matrix has been completed.

`nx, ny` (``PLINT``, input)

  Dimensions of the matrix to be freed.

This function is used in C examples 8, 9, 11, 14, 16, 20, 21, 22, 28, 30.

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