Gnuplot: How to display actual values on top of each bar in a bar-plot?-CodePudding

First-timer with gnuplot. Essentially I'm interested in what the subject says. I already have a mechanism that works in terms of rendering the bars and I just want to add label-values on the top of each bar:

I have the following data in a file called 'data.dat':

1,Json,457054
2,MessagePack,685440
3,Cbor,1273723

I employ the following gnuplot configuration file 'plot.gp':

##
# file_path - path to the file from which the data will be read
# graphic_file_name - the graphic file name to be saved 
# y_label - the desired label for y axis
# y_range_min - minimum range for values in y axis
# y_range_max - maximum range for values in y axis
# column_1 - the first column to be used in plot command
# column_2 - the second column to be used in plot command
##

# graphic will be saved as 800x600 png image file
set terminal png

# allows grid lines to be drawn on the plot
set grid

# setting the graphic file name to be saved
set output graphic_file_name

# the graphic's main title
set title "Comparison"

# since the input file is a CSV file, we need to tell gnuplot that data fields are separated by comma
set datafile separator ","

# disable key box
set key off

# label for y axis
set ylabel y_label

# range for values in y axis
set yrange[y_range_min:y_range_max]

# to avoid displaying large numbers in exponential format
set format y "%.0f"

# vertical label for x values 
set xtics rotate

# set boxplots
set style fill solid
set boxwidth 0.5

# plot graphic for each line of input file
plot for [i=0:*] file_path every ::i::i using column_1:column_2:xtic(2) with boxes

And I run the following gnuplot command:

gnuplot                                                           \
            -e "file_path='data.dat'           "                  \
            -e "graphic_file_name='output.png' "                  \
            -e "y_label='y'                    "                  \
            -e "y_range_min='0000000''         "                  \
            -e "y_range_max='1500000'          "                  \
            -e "column_1=1                     "                  \
            -e "column_2=3                     "                  \
            plot.gp

I can't figure out how to use 'with labels' at the bottom of the .gp file. Any help appreciated.

CodePudding user response：

Here is yet another example. There is no need to do it in a for loop. You can use the pseudocolumn 0 (check help pseudocolumns) and lc var (check help linecolor variable) for setting the color.

Code:

### plot with boxes and labels
reset session

$Data <<EOD
1,Json,457054
2,MessagePack,685440
3,Cbor,1273723
EOD

set datafile separator comma
set style fill solid 0.3
set key noautotitle

set xrange[0.5:3.5]
set yrange[0:]
set format y "%.0f"
set grid x,y
set boxwidth 0.8 relative

plot $Data u 1:3:($0 1):xtic(2) w boxes lc var, \
        '' u 1:3:3 w labels offset 0,0.7
### end of code

Result: