The PLplot Plotting Library: Programmer's Reference Manual
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### `pltr1`: Linear interpolation for grid to world mapping using singly dimensioned coord arrays

`pltr1` (x, y, tx, ty, pltr_data);

Linear interpolation for grid to world mapping using singly dimensioned coord arrays. 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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`pltr0`: Identity transformation for grid to world mapping | Up | `pltr2`: Linear interpolation for grid to world mapping using doubly dimensioned coord arrays (column dominant, as per normal C 2d arrays)