GPP

Section: User Commands (1)
Updated: 07 October. 1993
Index Return to Main Contents

NAME

gpp - a program for plotting graphs

SYNOPSIS

gpp [ -l<d> ] [ -s <s1> <s2> ] [ -r<fact> ] [ -S ] [ -P ]
[ -G ] [ -c ] [ -m<n> ] [ -w<n> ] [ -g ] [ -p<n> ] [ -L ]
[ -x xmin xmax ] [ -y ymin ymax ] [ -X ] [ -Y ] [ -Mx<n> ]
[ -My<n> ] [ -f<fontname> ] [ -d<device> ] file or -

DESCRIPTION

This program displays multiple graphs with various curve fitting and axis options. The following options are available:

-l<d>: Perform a least square fit of degree "d" on each curve.
-s <s1> <s2>: Perform a cubic spline fit on each curve, with end slopes s1 and s2 (Ie. a clamped spline)
-r <fact>: Reduce (if fact < 1.0) or enlarge (if fact > 1.0) the entire plot.
-S: Perform a cubic spline fit on each curve using a cardinal spline and the VOGLE(3) routine curve(). The end slopes are calculated as the tangent to the curve formed by the lines connecting the first and second points and the last and next to last points.
-P: Perform a power equation fit on each curve.
-G: Perform a saturated growth rate fit on each curve.
-m<n>: Place a marker at every "n"th data point on each curve.
-g<n>: Place a grid over the graph, with grid spacing of every nth tickmark.
-p<n>: Draws only markers at every <n>th data point
-L: Print legends if they are provided.
-x xmin xmax: Specify absolute x scaling values. This option by-passes the auto-scaling of the x-axis values.
-y ymin ymax: Specify absolute y scaling values. This option by-passes the auto-scaling of the y-axis values.
-X: Draw the X-axis using a logarithmic scale.
-Y: Draw the Y-axis using a logarithmic scale.
-Mx<n>: Sets the number of minor tickmarks between (and including) major tickmarks along the X axis.
-My<n>: Sets the number of minor tickmarks between (and including) major tickmarks along the Y axis.
-f<fontname>: Use font name fontname where fontname is any font available in the VOGLE(3) library.
-d<device>: Use the output device "device". These are the devices compiled into the VOGLE(3) library. Some examples are: postscript, hpgl, tek, sun etc.
file: The name of the input file. If it is a minus '-' stdin is assumed.

The input file contains two lines at the type which describe the graph. The first line gives the title, and the second line the type. At the moment the only type supported is "xy". The axes titles appropriate to the type of the graph are on the lines following the type statement. After the axes titles the first legend title is given followed by an axes descriptor on the next line. gpp then reads in points appropriate to the axes descriptor until it reaches a plot statement. This tells it to save the current points as a seperate plot. It then looks for another legend followed by an axes statement, and the cycle continues. Legends and titles may be blank lines.

        A title for the graph
        type xy
        A title for the x-axis
        A title for the y-axis
        legend for the first plot
        axes xy
        x y
        x y 
        . .
        . .
        plot xy
        legend for the second plot
        axes x
        x
        x
        . 
        .
        plot xy

FILES

/usr/local/lib/hershey/* Font files.

BUGS

There are too many options. There may be only 1024 points per trace. Interpretation of Endslopes for splines when using logarithmic scalings is Sketchy.

This document was created by man2html, using the manual pages.
Time: 00:21:26 GMT, December 05, 2024