plMinMax2dGrid: Find the minimum and maximum of a 2d grid allocated using plAlloc2dGrid.

`plMinMax2dGrid`: Find the minimum and maximum of a 2d grid allocated using `plAlloc2dGrid`.
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#### `plMinMax2dGrid`: Find the minimum and maximum of a 2d grid allocated using `plAlloc2dGrid`.

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

Find the minimum and maximum of a 2d grid allocated using `plAlloc2dGrid`.

`f` (`PLFLT **`, input)

  PLFLT grid to find the maximum / minimum of.

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

  Dimensions of `f`.

`fmax, fmin` (`PLFLT *`, output)

  Maximum and minimum values in the grid `f`.

This function is currently available in C, C++, Java, Ocaml and Python.

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

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