X-graph in NS2 - xgraph for throughput -xgraph from trace file - xgraph command

Xgraph is easy and very Useful.

Xgraph in NS2

•  Xgraph draws a graph on a Display device.

• Display upto 64 Independent data sets using  different colors

• The input data can be read from either data file or from standard input if no files are specified

• It annotates the graph with a title, axis labels grid lines or tick marks, grid labels, and  legend.

Windows Interface

• The interface used to specify the size and location of this window depends on the window manager currently in use.

• Once the window has been opened, all of the data sets will be displayed graphically with a legend in the upper right corner of the screen.

• Xgraph also presents three control buttons in the upper left corner of each window.

Xgraph command options       

• -geometry WxH (Geometry)

•  Specifies the initial size and location of the Xgraphwindow.

•  -bar (BarGraph) Specifies that vertical bars should be drawn from the data points to a base point which can be specified with -brb.

•  -brb <base> (BarBase) 

•  This specifies the base for a bar graph. By default, the base is zero.

• -brw <width> (BarWidth)

•  This specifies the width of bars in a bar graph. The amount is specified in the user’s units. By default, a bar one pixel wide is drawn.

Xgraph Command:Execution

• xgraph DataFile.txt –geometry 400x400,  Here DataFile.txt can be Replaced with trace file generated from Ns-2.this command will show the graph using X and Y co-ordinates with Geometry of 400X400

• xgraph DataFile.txt –geometry 400x400 –bar –brb 2 –brw 0.5 –tk –bb –nl –bg white –t “Example_Xgraph” –x “Xaxis” –y “Yaxis” . This command will generate Bar Graph.

• Xgraph DataFile.txt DataFile2.txt –bg white –tk –bb –m -M –t “Marker” –geometry  800x400.This command used to compare the two Files and generated graph

Awk and Xgraph

• Awk programming is used to generate the detailed analysis of NS-2 trace file.

• Metric's like Throughput,end-to-end Delay,Jitter,NRL,Packet Delivery ratio can be calculated using Awk scripts. Generate output's  by changing scenario files.

• Keep these outputs in a Text file in the Form of X and Y co-ordinates .for example, you can keep No_of _mobile nodes on X-axis and PDF on Y-axis. 

Xgraph of two Trace files in NS2

• Xgraph can generated using Two files .This graph will show the comparison of two files with different data 

• command :Xgraph DataFile.txt DataFile2.txt –bg white –tk –bb –m -M –t “Marker” –geometry  800x400

• Like wise One can compare two Routing Protocols and evaluate the best among them. For example comparison of AODV performance with DSDV in MANET. 

Sample Xgraph Generation ---->Node size vs PDR 

• Create a text file named  PDRvsNODE.txt and keep the data as like the below format .First column represent node size, (5 ,10,20,30,40,50) and 2 nd column specifies pdr that you got after running pdr.awk scipt for no of nodes set in your tcl file . Location of the text file need to specified clearly while you are running the command.

5  99.5
10 99.7
20 99.0
30 95.6
40 94.8
50 95.9

Once you created text file and kept this data ,Run the command 

Xgraph PDRvsNODE.txt   –bg white –tk –bb –m -M –t “Marker” –geometry  800x400


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