plcon1: Contour plot, general 1-d mapping for Fortran 77

The PLplot Plotting Library: Programmer's Reference Manual
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### `plcon1`: Contour plot, general 1-d mapping for Fortran 77

`plcon1` (z, nx, ny, kx, lx, ky, ly, clevel, nlevel, xg, yg);

Draws a contour plot of the data in ``z`[`nx`][`ny`]`, using the ``nlevel`` contour levels specified by ``clevel``. Only the region of the array from ``kx`` to ``lx`` and from ``ky`` to ``ly`` is plotted out. The arrays ``xg`` and ``yg`` are used to specify the transformation between array indices and world coordinates. See the Section called Contour and Shade Plots in Chapter 3 for more information.

`z` (`PLFLT **`, input) Pointer to a vectored two-dimensional array containing data to be contoured. `nx, ny` (`PLINT`, input) Physical dimensions of array ``z``. `kx, lx` (`PLINT`, input) Range of `x` indices to consider. `ky, ly` (`PLINT`, input) Range of `y` indices to consider. `clevel` (`PLFLT *`, input) Pointer to array specifying levels at which to draw contours. `nlevel` (`PLINT`, input) Number of contour levels to draw. `xg, yg` (`PLFLT *`, input) Pointers to arrays which specify the transformation from array indices to world coordinates. These must be one-dimensional arrays, used for a transformation of the form: `tx` = `f(x)`, `ty` = `f(y)`. Function values at locations between grid points are obtained via linear interpolation.

NOTE: this function is intended for use from a Fortran 77 caller only. The C user should instead call `plcont` using the built-in transformation function `pltr1` for the same capability.

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