## functions in graph.i - l

legend

legend= plotting keyword sets the legend for a plot. The default legend is a concatentation of the strings used in the original plotting command (plg, plm, etc.), except for the plt command, which has no default legend. Legends are never plotted to the X window; use the plq command to see them interactively. Legends will appear in hardcopy output unless they have been explicitly turned off. PLOTTING COMMANDS: plg, plm, plc, plv, plf, pli, plt, pldj Keyword, defined at i0/graph.i line 927SEE ALSO: hide

limits

limits or limits, xmin, xmax, ymin, ymax, square=0/1, nice=0/1, restrict=0/1 or old_limits= limits() or limits, old_limits In the first form, restores all four plot limits to extreme values. In the second form, sets the plot limits in the current coordinate system to XMIN, XMAX, YMIN, YMAX, which may be nil or omitted to leave the corresponding limit unchanged, a number to fix the corresponding limit to a specified value, or the string "e" to make the corresponding limit take on the extreme value of the currently displayed data. If present, the square keyword determines whether limits marked as extreme values will be adjusted to force the x and y scales to be equal (square=1) or not (square=0, the default). If present, the nice keyword determines whether limits will be adjusted to nice values (nice=1) or not (nice=0, the default). There is a subtlety in the meaning of "extreme value" when one or both of the limits on the OPPOSITE axis have fixed values -- does the "extreme value" of the data include points which will not be plotted because their other coordinate lies outside the fixed limit on the opposite axis (restrict=0, the default), or not (restrict=1)? If called as a function, limits returns an array of 5 doubles; OLD_LIMITS(1:4) are the current xmin, xmax, ymin, and ymax, and int(OLD_LIMITS(5)) is a set of flags indicating extreme values and the square, nice, restrict, and log flags. In the fourth form, OLD_LIMITS is as returned by a previous limits call, to restore the limits to a previous state. In an X window, the limits may also be adjusted interactively with the mouse. Drag left to zoom in and pan (click left to zoom in on a point without moving it), drag middle to pan, and click (and drag) right to zoom out (and pan). If you click just above or below the plot, these operations will be restricted to the x-axis; if you click just to the left or right, the operations are restricted to the y-axis. A ctrl-left click, drag, and release will expand the box you dragged over to fill the plot (other popular software zooms with this paradigm). If the rubber band box is not visible with ctrl-left zooming, try ctrl-middle or ctrl-right for alternate XOR masks. Such mouse-set limits are equivalent to a limits command specifying all four limits EXCEPT that the unzoom command can revert to the limits before a series of mouse zooms and pans. Holding the shift key and pressing the left mouse button is equivalent to pressing the middle mouse button. Similarly, pressing meta-left is equivalent to the right button. This permits access to the middle and right button functions on machines (e.g.- most laptops) with two button or one button mice. The limits you set using the limits or range functions carry over to the next plot -- that is, an fma operation does NOT reset the limits to extreme values. Builtin function, documented at i0/graph.i line 771SEE ALSO: plsys, range, logxy, zoom_factor, unzoom, plg, viewport

logxy

logxy, xflag, yflag sets the linear/log axis scaling flags for the current coordinate system. XFLAG and YFLAG may be nil or omitted to leave the corresponding axis scaling unchanged, 0 to select linear scaling, or 1 to select log scaling. Builtin function, documented at i0/graph.i line 848SEE ALSO: plsys, limits, range, plg, gridxy