plMinMax2dGrid: Find the minimum and maximum of a PLFLT matrix of type PLFLT_MATRIX allocated using plAlloc2dGrid

`plMinMax2dGrid`: Find the minimum and maximum of a PLFLT matrix of type PLFLT_MATRIX allocated using `plAlloc2dGrid`
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#### `plMinMax2dGrid`: Find the minimum and maximum of a PLFLT matrix of type PLFLT_MATRIX allocated using `plAlloc2dGrid`

`plMinMax2dGrid (` | f,
| nx,
| ny,
| fmax,
| fmin`)`;

Find the minimum and maximum of a PLFLT matrix of type PLFLT_MATRIX allocated using `plAlloc2dGrid`.

`f` (``PLFLT_MATRIX``, input)

  A matrix to find the maximum / minimum of.

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

  Dimensions of `f`.

`fmax, fmin` (``PLFLT_NC_SCALAR``, output)

  Returned maximum and minimum values of the matrix `f`.

This function is used in C examples 8, 11, 20 and 21.

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