pltr0: Identity transformation for grid to world mapping

The PLplot Plotting Library: Programmer's Reference Manual
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### `pltr0`: Identity transformation for grid to world mapping

`pltr0` (x, y, tx, ty, pltr_data);

Identity transformation for grid to world mapping. This routine can be used both for `plcont` and `plshade`. See also the Section called Contour Plots from C in Chapter 3 and the Section called Shade Plots from C in Chapter 3.

`x` (`PLFLT`, input) X-position in grid coordinates. `y` (`PLFLT`, input) Y-position in grid coordinates. `tx` (`PLFLT *`, output) X-position in world coordinates. `ty` (`PLFLT *`, output) Y-position in world coordinates. `pltr_data` (`PLPointer`, input) Pointer to additional input data that is passed as an argument to `plcont` or `plshade` and then on to the grid to world transformation routine.

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`plsfile`: Set output file handle | Up | `pltr1`: Linear interpolation for grid to world mapping using singly dimensioned coord arrays