Provided by: ygraph_0.16~cvs20090218-1.2ubuntu1_amd64 
NAME
ygraph - plot and animate 1D data
SYNOPSIS
ygraph [ -cspgrv? ] [ -C columns ] [ -d delay ] [ -k step ] [ -x xmin,xmax ] [ -y
ymin,ymax ] [ -S file1 file2 ] [ -I file ] [ --frame-integrate file ] [ --time-integrate
file ] [ file ... ]
DESCRIPTION
ygraph is a simple program to produce an xy-plot of 1D data. It features animation,
zooming, and the ability to load multiple data sets into a single plot.
ygraph is intended to be a quick first-glance data reader, so simple, instinctive use was
the major design goal. Most features are directly available from the control panel and
plot window menus. Some data manipulation functions are present, but fancy plot formatting
has been largely ignored, as there already exist more sophisticated tools for producing
publication quality plots.
The input file format read by ygraph is a slight generalisation of the historical xgraph
format which, for instance, is generated by the standard I/O methods of the Cactus
Computational Toolkit <URL:http://www.cactuscode.org/>. A more detailed description of the
input file format is given below.
The special filename - can be used to read data from the standard input:
cat data1.xl | ygraph -
Filenames starting with '<' are interpreted and opened as pipe:
ygraph "<cat data1.xl"
Command-line options are as follows:
-c, --no-control-panel
Start without the control panel.
-s, --separate-windows
Start with each requested plot in a separate window.
-p, --no-points
Turn off points drawn at each data point
-g, --no-grid
Don't draw a grid on the plot background.
-r, --no-range
Don't draw axis range values on the plot background.
-C, --columns column list
Set (globally) the columns to be read from the input in the format x:y. Default is
1:2.
-d, --delay time
Delay between successive animation frames. The specified value time should be an
integer representing the number of milliseconds to delay between frames.
-k, --skip n
Read in only every nth frame of data.
-l, --legend pos
Set the position of the plot legend in the plot window. Valid pos values are:
a -- the legend is placed above the plot
r -- the legend is placed to the right of the plot
o -- the legend is placed over the plot data
0 -- the legend is turned off (not displayed).
By default, the legend is placed over the plot data, `o'.
-S, --subtract file1 file2
Subtract the second listed file from the first. If x-values of the two plots don't
match, then values of the second are interpolated linearly to points of the first.
-I, --integrate file
Integrate file assuming f(left boundary)=0
--frame-integrate file
Integrate frames of file
--time-integrate file
Integrate frames of file and multiplying with time given by comments in the file
-?, --help
List the command line options and exit.
-v, --version
Print a version message and exit.
Filenames are usually treated as regular files that may be compressed with either gzip or
bzip2. If a filename is prefixed with <, it is treated as a command instead, and data will
be read from its standard input. A filename can also be a single -, which will read data
from ygraph's standard input.
USAGE
Once the plot window is displayed, most of the available actions should be obvious from
the menu bar and control panel buttons.
ZOOM
To zoom in to a region of the plot, click the mouse left button at the upper left corner,
drag to the lower right corner, and release the button. A menu option exists to unzoom
back to the plot's original dimensions.
LOGARITHMIC PLOTS
Logarithmic axes can be set up using the `Setting/Range...' dialog. Alternatively, the
`shift-L' keybinding can be used to toggle between the following four axis configurations
in order: (x,y) = (linear,linear), (linear,log), (log,log), (log,linear).
DERIVATIVES
The derivative of any displayed plot can be calculated by using the `/Plot/Derivative'
menu option from the plot window.
DIFFERENCE BETWEEN DATA SETS
The difference between a pair of data sets can be plotted using the -S command line option
(the next two listed files will be subtracted pointwise) or the `Plot/Subtract A-B...'
menu option. Linear interpolation of the subtracted data set is used if the data
locations do not line up exactly.
RE-SCALED DATA SETS
The y-values of individual data sets can be rescaled using the `Plot/Scale...' dialog.
POINTER LOCATION
Right-clicking at any point in the plot window will print the pointer location on the plot
background. The labels remain until the window is refreshed. The `c' keybinding can be
used to force a refresh and clean off the labels.
EXPORT OF IMAGES AND ANIMATIONS
It is possible to export a single frame of a plot using the `File/Export image...' menu
option. The extension of the chosen file name will determine the type of data which is
output (eg. jpeg, png, tiff, ps, etc.).
Currently, support for animations exists only in the form of allowing the export of
multiple frames of a plot, which must then be recombined afterwards using external
software. Multiple frames of an animation can be saved to a directory using the
`File/Export animation...' menu option. On selecting this option, the user is asked to
give a directory name in which a sequence of images corresponding to the currently loaded
frames of the plot will be saved. By default, the frames are saved in png format under the
names frame_000001.png, frame_000002.png, etc. The resulting files can be combined to
produce an animation using an external tool, such as the convert utility distributed with
ImageMagick. For example, if the animation frames were saved to the directory anim_data,
then the command
convert -delay 20 anim_data/frame*.png test_anim.gif
could be used to create an animated gif (test_anim.gif) whose frames consist of the images
in anim_data with a delay of 20/100 seconds between successive frames.
HINTS
• If at any time you lose track of the control panel (eg. by covering it with other
windows), you can raise it by pressing `p' in a plot window.
• If you find the control panel annoying, don't forget the '-c' command line option, which
suppresses the control panel on startup. You can use keybindings to control the
animation, and call up the control panel at any time using the 'p' key.
• If you would like to test convergence of a set of data sets at different resolutions,
you can load them into ygraph and rescale individual plots using the `Plot/Scale...'
dialog.
KEYBINDINGS
The following keybindings are available from the plot window:
h -- go to the first frame
j -- step back one frame
k -- step forward one frame
l -- go to the last frame
space -- play/pause
s -- show all frames
L -- toggle log/linear axes (lin-lin, lin-log, log-log, log-lin)
c -- clean the window
p -- raise the control panel, if it's hidden behind the plot window
C-n -- open a new plot window
C-o -- open a new file in the current window
C-p -- open a new file in a new window
C-e -- export individual frames as images
C-m -- export multiple frames as images
C-w -- close the plot window
C-d -- take a spatial derivative of the current plot
C-s -- subtract one data set from another
C-m -- rescale data sets
C-u -- unzoom
C-x -- open the plot range dialog
C-p -- toggle the display of dots at each data point
C-g -- toggle display of grid lines
C-r -- toggle display of ranges on the plot window
C-k -- open a window listing the keybindings
C-q -- quit ygraph
Left-mouse -- zoom
Right-mouse -- print the mouse position on the plot
INPUT FILE FORMAT
ygraph reads the standard 1D xgraph data format output by Cactus. The data can be in the
form of an ASCII text file, gzipped or bzipped, in which case the file will be
automatically decompressed as it is read. XY-data are listed in columns of the form
<x-val1> <y-val1>
<x-val2> <y-val2>
<x-val3> <y-val3>
etc.
where x-val and y-val are floating point coordinates of (x,y) points to be plotted and are
seperated by at least one whitespace character. Multiple plots are seperated by a blank
line. Comment lines are delimited by beginning the line with a " (double-quote) character,
or by a hash `#' symbol. An optional time value can be assigned to each data frame by
adding a line of the form
"Time = <time-val>
to the head of a set of (x,y) values, where time-val is a floating point value which will
label the particular data set during animation. The plot can also be assigned a name by a
line of the form
"Label = <name>
The assigned name will be used in the legend of the plot.
INPUT DATA EXAMPLE:
"This is just a comment
"Label = Random numbers
"Time = 0.0
0.1 1.343
0.2 1.939
0.3 2.439
0.4 3.949
0.5 5.495
"Time = 0.2
0.1 1.442
0.2 2.303
0.3 3.349
0.4 4.192
0.5 6.029
EXAMPLES
To plot the files data1.xl and data2.xl in the same window, use:
ygraph data1.xl data2.xl
To plot the same pair of files but starting with each in a separate window, use:
ygraph -s data1.xl data2.xl
To plot columns 1 and 3 from a multi-column data file, use:
cut -f1,3 multicol.dat | ygraph -
To visualize data from multiple columns in one plot, use:
ygraph '<cut -f1,2 multicol.dat' '<cut -f1,3 multicol.dat'
To control the delay between successive frames of the animation of a data set, use the -d
flag. For example, to set the delay to 100ms, use:
ygraph -d 100 data1.xl
To plot a file with the x-range set to (-1,3) and the y-range to (-2,4), use:
ygraph -x -1,3 -y -2,4 data1.xl data2.xl
To plot data1.xl minus data2.xl, use:
ygraph -S data1.xl data2.xl
AUTHOR
The development of ygraph has been driven by the needs of the Numerical Relativity Group
<URL:http://numrel.aei.mpg.de/> at the Max-Planck-Institute fuer Gravitationsphysik, Golm,
Germany.
ygraph was originally written by Denis Pollney <firstname.lastname@aei.mpg.de>
<URL:http://numrel.aei.mpg.de/Misc/email.html>. Code has been contributed by a number of
authors, listed in the AUTHORS file of the source code distribution.
DISTRIBUTION
ygraph is distributed under the GNU General Public License.
More information, recent binaries, and source code can be found at the author's homepage
<URL:http://www.aei.mpg.de/~pollney/ygraph/>.
REPORTING BUGS
Please report problems to DP at the address above, or to the majordomo mailing list
<ygraph-users@aei.mpg.de>.
SEE ALSO
xgraph(1) convert(1)
05 December 2013 YGRAPH(1)