12 with no options takes pairs of numbers from the
13 standard input as abscissas
18 Successive points are connected by straight lines.
19 The graph is encoded on the standard output
24 If an ordinate is followed by
25 a nonnumeric string, that string is printed as a
26 label beginning on the point.
27 Labels may be surrounded with quotes
30 in which case they may be empty or contain blanks
32 labels never contain newlines.
34 The following options are recognized,
35 each as a separate argument.
38 Supply abscissas automatically; no
41 Spacing is given by the next
43 A second optional argument is the starting point for
44 automatic abscissas (default 0, or 1
47 or the lower limit given by
51 Break (disconnect) the graph after each label in the input.
54 Character string given by next argument
55 is default label for each point.
58 Next argument is grid style,
59 0 no grid, 1 frame with ticks, 2 full grid (default).
62 Next argument is a legend to title the graph.
64 are automatically printed as part
70 Next argument is mode (style)
72 0 disconnected, 1 connected.
73 Some devices give distinguishable line styles
74 for other small integers.
75 Mode \-1 (default) begins with style 1 and
76 rotates styles for successive curves under option
83 superposed curves appear in the input
84 with each abscissa value.
89 Save screen; no new page for this graph.
97 Next 1 (or 2) arguments are lower (and upper)
100 Third argument, if present, is grid spacing on
103 Normally these quantities are determined automatically.
110 Make automatically determined
117 Next argument is fraction of space for height.
123 Next argument is fraction of space to move right before plotting.
126 Similarly to move up before plotting.
129 Transpose horizontal and vertical axes.
132 now applies to the vertical axis.)
134 If a specified lower limit exceeds the upper limit,
143 Segments that run out of bounds are dropped, not windowed.
144 Logarithmic axes may not be reversed.
147 actually makes automatic limits, rather than automatic scaling,