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


display, cartography


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] [--help] [--verbose] [--quiet] [--ui]

Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog

x_file=string [required]
Name of data file for X axis of graph

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

Path to file location

Color for Y data

Color for axis, tics, numbers, and title
Default: black

Title for X data

Title for Y data

Title for Graph


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.

Path to the directory where the input files are located.
Example format: /usr/grass/data/graph

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).

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.

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.

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.

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.


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)

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