plaxes: Draw a box with axes, etc. with arbitrary origin

The PLplot Plotting Library: Programmer's Reference Manual
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### `plaxes`: Draw a box with axes, etc. with arbitrary origin

`plaxes` (x0, y0, xopt, xtick, nxsub, yopt, ytick, nysub);

Draws a box around the currently defined viewport with arbitrary world-coordinate origin specified by ``x0`` and ``y0`` and labels it with world coordinate values appropriate to the window. Thus `plaxes` should only be called after defining both viewport and window. The character strings ``xopt`` and ``yopt`` specify how the box should be drawn as described below. If ticks and/or subticks are to be drawn for a particular axis, the tick intervals and number of subintervals may be specified explicitly, or they may be defaulted by setting the appropriate arguments to zero.

`x0` (`PLFLT`, input) World X coordinate of origin. `y0` (`PLFLT`, input) World Y coordinate of origin. `xopt` (`const char *`, input) Pointer to character string specifying options for horizontal axis. The string can include any combination of the following letters (upper or lower case) in any order: `a`: Draws axis, X-axis is horizontal line (`y=0`), and Y-axis is vertical line (`x=0`). `b`: Draws bottom (X) or left (Y) edge of frame. `c`: Draws top (X) or right (Y) edge of frame. `f`: Always use fixed point numeric labels. `g`: Draws a grid at the major tick interval. `h`: Draws a grid at the minor tick interval. `i`: Inverts tick marks, so they are drawn outwards, rather than inwards. `l`: Labels axis logarithmically. This only affects the labels, not the data, and so it is necessary to compute the logarithms of data points before passing them to any of the drawing routines. `m`: Writes numeric labels at major tick intervals in the unconventional location (above box for X, right of box for Y). `n`: Writes numeric labels at major tick intervals in the conventional location (below box for X, left of box for Y). `s`: Enables subticks between major ticks, only valid if `t` is also specified. `t`: Draws major ticks. `xtick` (`PLFLT`, input) World coordinate interval between major ticks on the x axis. If it is set to zero, PLplot automatically generates a suitable tick interval. `nxsub` (`PLINT`, input) Number of subintervals between major x axis ticks for minor ticks. If it is set to zero, PLplot automatically generates a suitable minor tick interval. `yopt` (`const char *`, input) Pointer to character string specifying options for vertical axis. The string can include any combination of the letters defined above for ``xopt``, and in addition may contain: `v`: Write numeric labels for vertical axis parallel to the base of the graph, rather than parallel to the axis. `ytick` (`PLFLT`, input) World coordinate interval between major ticks on the y axis. If it is set to zero, PLplot automatically generates a suitable tick interval. `nysub` (`PLINT`, input) Number of subintervals between major y axis ticks for minor ticks. If it is set to zero, PLplot automatically generates a suitable minor tick interval.

Redacted form:

- General: `plaxes(x0, y0, xopt, xtick, nxsub, yopt, ytick, nysub)`

- Perl/PDL: `plaxes(x0, y0, xtick, nxsub, ytick, nysub, xopt, yopt)`

This function is not used in any examples.

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