Graph with no options takes pairs of numbers from the
standard input as abscissas (x-values) and ordinates
(y-values) of a graph. Successive points are connected by straight
lines. The graph is encoded on the standard output for display by
plot(1) filters.
If an ordinate is followed by a nonnumeric string, that string is
printed as a label beginning on the point. Labels may be surrounded with
quotes " " in which case they may be empty or contain blanks and
numbers; labels never contain newlines.
The following options are recognized, each as a separate
argument.
- -a
- Supply abscissas automatically; no x-values appear in the input.
Spacing is given by the next argument (default 1). A second optional
argument is the starting point for automatic abscissas (default 0, or 1
with a log scale in x, or the lower limit given by -x).
- -b
- Break (disconnect) the graph after each label in the input.
- -c
- Character string given by next argument is default label for each
point.
- -g
- Next argument is grid style, 0 no grid, 1 frame with ticks, 2 full grid
(default).
- -l
- Next argument is a legend to title the graph. Grid ranges are
automatically printed as part of the title unless a -s option is
present.
- -m
- Next argument is mode (style) of connecting lines: 0 disconnected, 1
connected. Some devices give distinguishable line styles for other small
integers. Mode -1 (default) begins with style 1 and rotates styles for
successive curves under option -o.
- -o
- (Overlay.) The ordinates for n superposed curves appear in the
input with each abscissa value. The next argument is n.
- -p
- Next argument is one or more of the characters bcgkmrwy, choosing
pen colors by their initial letter, as in Successive curves will cycle
through the colors in the given order.
- -s
- Save screen; no new page for this graph.
- -x l
- If l is present, x-axis is logarithmic. Next 1 (or 2)
arguments are lower (and upper) x limits. Third argument, if
present, is grid spacing on x axis. Normally these quantities are
determined automatically.
- -y l
- Similarly for y.
- -e
- Make automatically determined x and y scales equal.
- -h
- Next argument is fraction of space for height.
- -w
- Similarly for width.
- -r
- Next argument is fraction of space to move right before plotting.
- -u
- Similarly to move up before plotting.
- -t
- Transpose horizontal and vertical axes. (Option -a now applies to
the vertical axis.)
If a specified lower limit exceeds the upper limit, the axis is
reversed.
Segments that run out of bounds are dropped, not windowed.
Logarithmic axes may not be reversed. Option -e actually makes
automatic limits, rather than automatic scaling, equal.