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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.
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Y offset = 0 |
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Y offset = +5 |
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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.
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X offset = 0 |
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X offset = +5 |
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X offset = -5 |
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