ylabel — setting Y axis labels


\begin{rail} YLabel : 'ylabel' '(' ( () \vert String ) ')' ; \end{rail}
ylabel sets the label used on the Y axis of the current sub-plot. If this optional string argument is missing, or is a null length string, the label for the Y axis is missing. This routine must be called before doing the plot you want it to appear on. The label is printed sideways along the Y axis, centred on the axis. $\Longrightarrow$ This is not an built-in function. This function is normally loaded on start-up from the plot.r file in the standard rlib directory. Use of the -r option, incorrectly setting the RLAB_LIB_DIR environmental variable, or modifying plot.r may make this function unavailable.
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