The enhanced postscript terminal can display super- / sub-script
in the labels or axis names. To use this termianl one needs “enhanced”
option:
gnuplot> set terminal postscript enhanced
You can write the supersript as X^2, and the subscript is Y_3. To
make several letters super- / sub-script, you need brace like
Z_{64}. To use super and subscripts at the same time, try
Z@^2_{64}.
The following is an example to make legends with the superscripts.
The functions are y=sin**2(x), y=sin**3(x), and y=sqrt(sin(x)).
gnuplot> set terminal postscript eps enhanced
gnuplot> set key spacing 1.3
gnuplot> set xrange [ 0 : pi ]
gnuplot> set yrange [ 0 : 1.5 ]
gnuplot> plot sin(x)**2 ti "sin^2(x)",
sin(x)**3 ti "sin^3(x)",
sqrt(sin(x)) ti "sin^{1/2}(x)"
When texts in the legend contain super- / sub-scripts, text
lines become very close each other. In the example above,
the baseline skip was
increased to 30% by set key spacing 1.3 .
To use Greek letters in a text, you may try using
enhanced postscript terminal just like the case of super- / sub-scripts.
gnuplot> set terminal postscript enhanced
The Greek letters can be displayed by {/Symbol a}. This gives
“alpha” which corresponds to “a”. The relation of the Symbol and
alphabet is as follows.
ALPHABET
SYMBOL
ALPHABET
SYMBOL
alphabet
symbol
alphabet
symbol
A
Alpha
N
Nu
a
alpha
n
nu
B
Beta
O
Omicron
b
beta
o
omicron
C
Chi
P
Pi
c
chi
p
pi
D
Delta
Q
Theta
d
delta
q
theta
E
Epsilon
R
Rho
e
epsilon
r
rho
F
Phi
S
Sigma
f
phi
s
sigma
G
Gamma
T
Tau
g
gamma
t
tau
H
Eta
U
Upsilon
h
eta
u
upsilon
I
iota
W
Omega
i
iota
w
omega
K
Kappa
X
Xi
k
kappa
x
xi
L
Lambda
Y
Psi
l
lambda
y
psi
M
Mu
Z
Zeta
m
mu
z
zeta
You can also specify various postscript characters by octal codes, for
example, {/243} is a pound (L) mark, {/247} is a section mark. See ps_guide.ps which comes with gnuplot source distribution in detail.
The next example is to draw the linear function y=Alpha x+ Gamma
and two Greek letters with those values in the figure.
gnuplot> set terminal postscript eps enhanced
gnuplot> set xrange [ 0 : 5 ]
gnuplot> set label "{/Symbol a}=0.5, {/Symbol g}=0.2" at 2,0
gnuplot> plot 0.5*x-0.2 ti "y={/Symbol a}x-{/Symbol g}"
The interval can be controlled by the ofset options of set {x|y}label command.
gnuplot> set xlabel "x" 0.0,1.0
This moves the X-axis label one letter upward. When you give
a positive Y ofset, the X label gets into the graph.
While the ofset is negative, distance between the X label and the
graph becomes larger. Gnuplot tries to draw a graph as large as
possible, so the graph hight becomes larger when the X-axis label
moves upward. On the contrary the graph becomes small when
the X-axis goes downward.
Y offset = 0
Y offset = +5
Y offset = -5
To adjust the Y-axis label, use set ylabel "Y-AXIS" +n,+m where “+n” and “+m” are the Y-axis ofset options. The following
examples are to set the X ofset “+5” and “-5”. This affects the width
of the graph.
