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I have a csv file includes two column 

no. of packet   size 
1               60 
2               70 
3              400
4              700
.
.
.
1000000         60

where the first column is

the number of packet

, and the second column is

the size of packet in bytes.

the total number of packets in the csv file is one million. I need to plot histogram for this data file by:

xrange = [0, 5 , 10 , 15 ]

which denotes the packet size in bytes. The range [0] denotes the packet size less than 100 bytes, and [5] denotes the packet bytes less than 500 bytes and so on. 

yrange = [ 10, 100, 10000, 100000000],

which denots the number of packets

Any help will be highly appreciated.

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2 Answers 2

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1

Don't quite remember exactly how this works, but the commands given in my Gnuplot in Action book for creating a histogram are

bin(x,s) = s*int(x/s)
plot "data-file" using (bin(1,0.1)):(1./(0.1*300)) smooth frequency with boxes

I believe smooth frequency is the command that's important to you, and you need to figure out what the using argument should be (possibly with a different function used).

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1 Comment

Brad Richardson... Thank you, i have download this book and i will read the code
1

This should do the job:

# binning function for arbitrary ranges, change as needed
bin(x) = x<100 ? 0 : x<500 ? 5 : x<2500 ? 10 : 15 

# every occurence is counted as (1)
plot datafile using (bin($2)):(1) smooth freq with boxes

Im not really sure what you mean by "yrange [10 100 1000 ...]", do you want a logscaled ordinate?

Then just 

set xrange [1:1e6]
set logscale y

before plotting.

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5 Comments

Karl Ratzsch... The [y] values in the output graph denote the number of packet from 1 to one million
Karl Ratzsch... when i implemented you code above, i got this message error invalid expression for the line code bin(x) = x<100 ? 0 : x<500 ? 5 : x<2500 ? 10 : 15
can't be, i just pasted it into the gnuplot console and it worked as expected. Check "help ternary operator" to see how the function works.
Karl Ratzsch... Thank you for your help .
You're welcome. Btw., if you ask a gnuplot question, you should stick to the gnuplot syntax. Your range specifiers e.g. are very obscure.

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