not so FAQ

• Legend
• Tics
• Label
• 2-D Plot
  • 
    fixed-size plot

  • 
    both sides of Y-axes

  • 
    erase axes

  • 
    fixed aspect ratio figure

  • 
    zero axis

  • 
    small bars of error bars

  • 
    larger letters

  • 
    smooth curves.

  • 
    points on border

  • 
    several figures

  • 
    grid at minor tics

  • 
    two axes

  • 
    grid at an arbitrary position

  • 
    figure in figure

  • 
    bar-chart

  • 
    Align two figures

  • 
    normal probability axis
• 3-D Plot
• Polar Coordinate
• Parametric Functions
• Data File
• After Plotting
• Miscellaneous Stuff

About 2-Dimensional Plot (No.5)

A small figure in a figure

Making a small figure inside a figure. Sometimes you may see a
magnified plot in a margin to make a crowded part clear. To put such a
magnified window, use multiplot. We
make about 1/4 of the full-size figure inside the main plot. Firstly
draw a main graph in the multiplot mode.

gnuplot> set xrange [ 0 : 20 ]
gnuplot> set yrange [ 0 : 6 ]
gnuplot> set xtics 5
gnuplot> set ytics 1
gnuplot> set multiplot
multiplot> set origin 0.0,0.0
multiplot> set size 1.0,1.0
multiplot> plot "file.dat" u 1:2:3 notitle with yerrorbars,
>               "file.cal" u 1:2   notitle with lines

Move the origin to the vacant place (0.45,0.1), and draw a small
graph there. The X and Y ranges should be determined to enlarge the
place where you want to magnify. The small figure is the same as the
main one except for the ranges, so that you can use the
replot command.

multiplot> set origin 0.45,0.1
multiplot> set size 0.5,0.5
multiplot> set xrange [ 1 : 5 ]
multiplot> set yrange [ 2.4 : 3.0 ]
multiplot> set ytics 0.5
multiplot> replot
multiplot> set nomultiplot
gnuplot>

Now you can see clearly the part where there exists many
data points. We chose the origin and size so as not to overlap
those two figures. It is impossible to erase lines and points of
the main figure which intrude the small one with gnuplot.

X and Y axis names for the small graph should be empty,
even the main figure has those stuff. When you want to make a reduced
size EPS, the set size command
should be outside the multiplot mode. Otherwise gnuplot defines
BoundingBox in your Postscript file so as to include a whole screen.
You can see an example in our gallery.

A simple bar-chart

Gnuplot (if older than ver.3.6) draws open rectangulars when
with boxes is used to make a bar-chart, as you can see an example. Gnuplot ver.3.8 and newer
can draw a filled box.

If you are making a Postscript figure, the easiest way is to draw a
figure with impluses with very thick lines. In the next
example we defined the line type 1 which is 50 times thicker than
the default width.

gnuplot> set term postscript eps enhanced color
gnuplot> set linestyle 1 lt 1 lw 50
gnuplot> # for gnuplot ver.4
gnuplot> # set style line 1 lt 1 lw 50
gnuplot> plot "test.dat" using 1:2 with imp ls 1

[ver.4] ONLY !

Gnuplot Ver.4 has an option to fill the boxes, which is with
boxes fs [pattern | solid] (fillstyle). Also you can use set style
fill to define the color-fill pattern separately.

In the case of with boxes fs pattern , the pattern number
is used to specify the filling pattern. In the case of solid
option, density of the filled box is given by a value ranging from 0 to
1.

In the example below, (3) stands for the bar-width.

gnuplot> plot "test.dat" usi 1:2:(3)      w boxes fs pattern 1,
gnuplot>      "test.dat" usi ($1+5):2:(3) w boxes fs solid 0.7