The PLplot Plotting Library: Programmer's Reference Manual
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# Labeling the Graph

The function `pllab` may be called after `plenv` to write labels on the x and y axes, and at the top of the picture. All the variables are character variables or constants. Trailing spaces are removed and the label is centered in the appropriate field. The syntax for `pllab` is:

`pllab` (xlbl, ylbl, toplbl);

`xlbl` (`char *`, input) Pointer to string with label for the X-axis (bottom of graph). `ylbl` (`char *`, input) Pointer to string with label for the Y-axis (left of graph). `toplbl` (`char *`, input) Pointer to string with label for the plot (top of picture).}

More complex labels can be drawn using the function `plmtex`. For discussion of writing text in a plot see the Section called Writing Text on a Graph, and for more detailed discussion about label generation see the Section called Writing Text on a Graph.

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Defining Plot Scales and Axes | Up | Drawing the Graph