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Every plotting primitive function accepts a legend= keyword to allow you to set a legend string describing that object. If you do not supply a legend= keyword, Yorick supplies a default by repeating a portion of the command line. For example,
plg, cos(x), x |
will have the default legend "A: plg, cos(x), x", assuming that the curve marker for this curve is "A". You can specify a more descriptive legend with the legend= keyword:
plg, cos(x), x, legend="oscillating driving force" |
If you want the legend to have the curve marker prepended, so it is "A: oscillating driving force" if the curve marker is "A", but "F: oscillating driving force" if the curve marker is "F", you can begin the legend string with the special character "\1":
plg, cos(x), x, legend="\1: oscillating driving force" |
Like legends, you can specify a curve marker letter with the marker= keyword, but if you don’t, Yorick picks a value based on how many curves have been plotted. By default, Yorick draws the marker letter on top of the curve every once in a while – so A’s mark curve A, B’s mark curve B, and so on. This is only relevant for the plg and plc commands. This default style is ugly; use it for working plots, not polished graphics. You should turn the markers off by means of the marks=0 keyword for high quality plots, and distinguish your curves by line type. For example,
plg, cos(x), x, marks=0, type="dash", legend="oscillating driving force (dash)" |
In order to conserve screen space, legends never appear on your screen; they only appear in hardcopy files. Furthermore, depending on the graphics style, legends may not appear in hardcopy either. In particular, the ‘vg.gs’ and ‘nobox.gs’ styles have no legends. This is because legends are ugly. Legends take the place of a proper figure caption in working plots. For high quality output, I expect you to take the trouble to add a proper caption. You can use the legends=0 keyword to the window command in order to eliminate the legends even from those graphics styles where they normally appear.
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