Ubuntu Manpage: d.linegraph - Generates and displays simple line graphs in the active graphics monitor

NAME

       d.linegraph   -  Generates  and displays simple line graphs in the active graphics monitor
       display frame.

KEYWORDS

       display, cartography

SYNOPSIS

       d.linegraph
       d.linegraph help
       d.linegraph       x_file=string       y_file=string[,string,...]        [directory=string]
       [y_color=string[,string,...]]   [title_color=string]   [x_title=string]   [y_title=string]
       [title=string]   [--verbose]  [--quiet]

   Parameters:
       x_file=string
           Name of data file for X axis of graph

       y_file=string[,string,...]
           Name of data file(s) for Y axis of graph

       directory=string
           Path to file location
           Default: .

       y_color=string[,string,...]
           Color for Y data
           Options:
           red,orange,yellow,green,blue,indigo,violet,white,black,gray,brown,magenta,aqua,grey,cyan,purple

       title_color=string
           Color for axis, tics, numbers, and title
           Options:
           red,orange,yellow,green,blue,indigo,violet,white,black,gray,brown,magenta,aqua,grey,cyan,purple
           Default: black

       x_title=string
           Title for X data
           Default:

       y_title=string
           Title for Y data
           Default:

       title=string
           Title for Graph
           Default:

DESCRIPTION

d.linegraph is a primitive program to draw simple x,y line graphs based on numerical data
contained in separate files.

Data file format
The X and Y data files for the graph are essentially a column of numbers in each file,
with one input number per line. The program expects that each X value will have a
corresponding Y value, therefore the number of lines in each data input file should be the
same. Essentially, the X data becomes the X axis reference to which the Y data is plotted
as a line. Therefore, the X data should be a monotonically increasing progression of
numbers (i.e. "1,2,3,..."; "0, 10, 100, 1000,..."; "...-5,-1,0,1,5..."). If multiple Y
data files are used, the Y axis scale will be based on the range of minimum and maximum
values from all Y files, then all Y data given will be graphed according to that Y scale.
Therefore, if multiple Y data inputs are used with dissimilar units, the graph produced
comparing the two will be deceptive.

directoryname
Path to the directory where the input files are located. If this option is not
used, the d.linegraph looks for files in the current directory.
Example format: directory/usr/grass/data/graph

ycoloroption[,option,...]]
Color to be used for drawing the lines in the graph. If multiple Y data files are
used, an equal number of colors may be used to control the colors of the lines.
Colors will be assigned to Y data in respect to the sequence of instantiation on
the command line. Options are listed below. By default, a series of colors will
be chosen by the program if none are provided upon invocation.
Order of default colors: yellow, red, green, violet, blue, orange, gray, brown,
magenta, white, indigo).

titlecoloroption
The color to be used for titles, axis lines, tics, and scale numbers.
Default: "white"
Color options: red, orange, yellow, green, blue, indigo, violet, magenta, brown,
gray, white, and black.

xtitlevalue
Title to describe X data. Will be centered beneath the graph. Default is no title
unless the need for a unit descriptor is computed by the program (i.e. X: title in
hundreds). Also, see NOTES section (below) for a format caveat for multi-word
titles.

ytitlevalue
Title to describe Y data. Will be centered beneath the X data title. Default is no
title unless the need for a unit descriptor is computed by the program (i.e. Y:
ttiittllee in thousands). Also, see NOTES section (below) for a format caveat for
multi-word titles. In the case of graphs with multiple lines, one may wish to use
more specific title placement by using the d.text or v.label programs.

titlevalue
Title to describe the graph. Will be centered over the top of graph. Default is no
title. See NOTES section (below) for a format caveat for multi-word titles.

NOTES

       Since  the  command line parser is not amiable to multiple word inputs, to input titles of
       more than one word, use the underscore character ("") to represent spaces (" ").

       Example: "titleCensusdata1990" would be printed over the graph as "Census data 1990".

       The way the program locates and labels  tic  marks  is  less  than  perfect:  1)  although
       distances  between Y tics is proportional to the value, they are not proportional on the X
       axis; 2) decimal values between -1 and 1 can be printed on the X axis, but not on Y. (With
       respect  to  the  later,  the  input  for Y values can all be multiplied by a factor of 10
       before graphing).

       It might be easier to use  a  3rd  party  tool  such  as  xgraph  or  GNUplot  instead  of
       d.linegraph.   (You  can  make GNUplot output pretty by using its SVG or PostScript output
       driver and converting that back into a rasterized image in a paint program)

AUTHOR