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 mappingUppltr2: Linear interpolation for grid to world mapping using doubly dimensioned coord arrays (column dominant, as per normal C 2d arrays)