The simplest case is that there is only one group of data to be plotted. In this case you just set the boxwidth to a proper value, for example 0.95, and plot it with boxes. Here is an example.
The data file is like this:
1975 0.5 9.0 1980 2.0 12.0 1985 2.5 10.1 1990 2.6 9.1 1995 2.0 7.2 2000 5.0 8.0 2005 10.2 6.0 2010 15.1 6.2
reset set term png truecolor set output "profit.png" set xlabel "Year" set ylabel "Profit(Million Dollars)" set grid set boxwidth 0.95 relative set style fill transparent solid 0.5 noborder plot "profit.dat" u 1:2 w boxes lc rgb"green" notitle
Plot histogram using boxes with one group of data |
When there is more than one group of data to plot, the boxwidth and gap between the boxes should be calculated carefully. We do it like this:
reset dx=5. n=2 total_box_width_relative=0.75 gap_width_relative=0.1 d_width=(gap_width_relative+total_box_width_relative)*dx/2. reset set term png truecolor set output "profit.png" set xlabel "Year" set ylabel "Profit(Million Dollars)" set grid set boxwidth total_box_width_relative/n relative set style fill transparent solid 0.5 noborder plot "profit.dat" u 1:2 w boxes lc rgb"green" notitle,\ "profit.dat" u ($1+d_width):3 w boxes lc rgb"red" notitle
Plot histogram using boxes with more than one group of data |
Your gnuplot blogs are very useful.
ReplyDeleteCould you explain what the parameters in these lines mean?
plot "profit.dat" u 1:2 w boxes lc rgb"green" notitle,\
"profit.dat" u ($1+d_width):3 w boxes lc rgb"red" notitle
The full version of these two lines is:
Deleteplot "profit.dat" using 1:2 with boxes linecolor rgb"green" notitle,\
"profit.dat" using ($1+d_width):3 with boxes linecolor rgb"red" notitle
where
"using 1:2" means plot the graph using the first and second column,
"with boxes" means plot with plotstyle---boxes,
linecolor rgb"green" means plot with green color
and at last "notitle" means the legend not plotted.
what is $1
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I want to create graph for this data, how can i modify your above code.
plot "file.dat" u 0:2 w boxes lc rgb"green" notitle
Deleteset xtics ("html" 0,"css" 1, "image" 2, "javascript" 3,"other" 4)
Or simply
Deleteplot "file.dat" u 0:2:xtic(1) w boxes lc rgb"green" notitle
Thank you for your post.
DeleteBut I don't understand how that is going to work. What is meant by plotting 0:2:xtic(1)? Is it possible to create a column diagramm with more than one group of data?
Thank you in advance.
I think this means that the values on the x axis will be assigned dynamically, the values on the y axis will be taken from the 2nd column and the descriptions under the x axis will be taken from 1st column.
DeleteIt took me a while to figure out that in order to plot the second set of data it is necessary to refer to the x axis values using the $0, e.g.:
plot datafile using 0:2:xtic(1) with boxes title "1. measurement" linecolor rgb "#7030a0",\
datafile using ($0+offset):3 with boxes title "2. measurement" linecolor rgb "#00b050",\
datafile using ($0+2*offset):4 with boxes title "3. measurement" linecolor rgb "#00b0f0"
In addition, it allows you to plot lines over histogram-like boxes. You cannot do it if you use real histograms (as far as I know).
ReplyDeleteThanks for the share !
Many thanks for this article! :)
ReplyDeletevery useful indeed
ReplyDeletei want to plot the same histograms with fill pattern. please guide me.
ReplyDeletei have 3 columns with 11 values in each column. i want to give different patterns to columns so that it can be readable in gray scale printed form.
"set style fill pattern
Deleteplot sin(x) with boxes, cos(x) with boxes"
will plot sin(x) and cos(x) with different fill patterns. And your problem can be solved similarly.
And if you want to make this graph from the command line, what should be the syntax?
ReplyDeleteI am sorry! But I just did not get your meaning.
DeleteIn Command Line : gnuplot file.p make sure u r in exact directory with dat file
DeleteI want to add my own data file but when i to it says no data to plot
ReplyDeleteWhat if we have more than 3 columns? Then how will we draw the graph
ReplyDeletevery useful blog post. Thank you.
ReplyDeleteHi, I am new to gnuplot and would require your help. I want to plot a statistical histogram of 7 columns, having x at x-axis and frequency at Y axis. I have got the histogram using MATLAB, but I want to draw it using gnuplot. Example code of such histogram will be appriciated.
ReplyDeleteThanks
How can I overlay a gaussian curve fitted on hinstogram plot?
ReplyDeleteThats excellent!!
ReplyDeletethe post was really helpful, thank you
ReplyDeleteIs there any way I can plot without horizontal lines, something like this: https://www.oreilly.com/openbook/cgi/figs/cgi0606.gif
ReplyDelete