plimagefr: Plot a 2D matrix using cmap1

`plimagefr`: Plot a 2D matrix using cmap1
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#### `plimagefr`: Plot a 2D matrix using cmap1

`plimagefr (` | idata,
| nx,
| ny,
| xmin,
| xmax,
| ymin,
| ymax,
| zmin,
| zmax,
| valuemin,
| valuemax,
| pltr,
| pltr_data`)`;

Plot a 2D matrix using cmap1.

`idata` (``PLFLT_MATRIX``, input)

  A matrix of values (intensities) to plot. Should have dimensions of `nx` by `ny`.

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

  Dimensions of idata

`xmin, xmax, ymin, ymax` (``PLFLT``, input)

  See the discussion of `pltr` below for how these arguments are used (only for the special case when the callback function `pltr` is not supplied).

`zmin, zmax` (``PLFLT``, input)

  Only data between zmin and zmax (inclusive) will be plotted.

`valuemin, valuemax` (``PLFLT``, input)

  The minimum and maximum data values to use for value to color mappings. A datum equal to or less than valuemin will be plotted with color 0.0, while a datum equal to or greater than valuemax will be plotted with color 1.0. Data between valuemin and valuemax map linearly to colors in the range (0.0-1.0).

`pltr` (``PLTRANSFORM_callback``, input)

  A callback function that defines the transformation between the zero-based indices of the matrix ``idata`` and world coordinates. If `pltr` is not supplied (e.g., is set to NULL in the C case), then the x indices of ``idata`` are mapped to the range `xmin` through `xmax` and the y indices of ``idata`` are mapped to the range `ymin` through `ymax`.

  For the C case, transformation functions are provided in the PLplot library: `pltr0` for the identity mapping, and `pltr1` and `pltr2` for arbitrary mappings respectively defined by vectors and matrices. In addition, C callback routines for the transformation can be supplied by the user such as the `mypltr` function in `examples/c/x09c.c` which provides a general linear transformation between index coordinates and world coordinates.

  For languages other than C you should consult Part III, “ Supported computer languages ” for the details concerning how `PLTRANSFORM_callback` arguments are interfaced. However, in general, a particular pattern of callback-associated arguments such as a `tr` vector with 6 elements; `xg` and `yg` vectors; or `xg` and `yg` matrices are respectively interfaced to a linear-transformation routine similar to the above `mypltr` function; `pltr1`; and `pltr2`. Furthermore, some of our more sophisticated bindings (see, e.g., Chapter 10, Fortran Language) support native language callbacks for handling index to world-coordinate transformations. Examples of these various approaches are given in `examples/<language>x09*`, `examples/<language>x16*`, `examples/<language>x20*`, `examples/<language>x21*`, and `examples/<language>x22*`, for all our supported languages.

`pltr_data` (``PLPointer``, input)

  Extra parameter to help pass information to `pltr0`, `pltr1`, `pltr2`, or whatever routine is externally supplied.

Redacted form:

- General: `plimagefr(idata, xmin, xmax, ymin, ymax, zmin, zmax, valuemin, valuemax, pltr, pltr_data)`

This function is used in example 20.

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