Chapters:
1: Introduction
2: Simple example
3: Invocation
4: Finer Control
5: XY Plots
6: Contour Plots
7: Image Plots
8: Examples
9: Gri Commands
10: Programming
11: Environment
12: Emacs Mode
13: History
14: Installation
15: Gri Bugs
16: Test Suite
17: Gri in Press
18: Acknowledgments
19: License
Indices:
Concepts
Commands
Variables

10.10.2: Mathematical text
10.10.2.1: Subscripts
As in TeX and LaTeX, you must be in mathmode to use subscripts;
in other words, you must enclose the string or substring in
dollarsigns. For singlecharacter subscripts, insert an underline
prior to the character to be subscripted:
For multiplecharacter subscripts, insert braces before and after the
item to be subscripted:
10.10.2.2: Superscripts
As in TeX and LaTeX, you must be in mathmode to use superscripts;
in other words, you must enclose the string or substring in
dollarsigns. For singlecharacter superscripts, insert a carat prior
to the character to be superscripted:
For multiplecharacter superscripts, insert braces before and after the
item to be superscripted:
10.10.2.3: Mathematical symbols
As in TeX and LaTeX, you indicate mathematical symbols and Greek
letters with backslash sequences. The following LaTeX symbols are
defined in math mode in Gri (cf tables in Lamport's section 3):
\Delta \Downarrow \Gamma \Im \Lambda \Leftarrow
\Leftrightarrow \Omega \Pi \Phi \Psi \Re
\Rightarrow \Sigma \Theta \Uparrow \Upsilon \Xi
\alpha \approx \ast \beta \bullet \chi \circ
\cong \delta \div \downarrow \epsilon \equiv
\eta \exists \forall \gamma \geq \gg \in \infty
\iota \kappa \lambda \langle \leftarrow
\leftrightarrow \leq \ll \mu \nabla \neq \nu
\omega \partial \phi \pi \pm \prod \propto \psi
\rangle \rho \rightarrow \sigma \sim \subset
\subseteq \sum \supset \supseteq \surd \sqrt
\tau \theta \times \uparrow \upsilon \varpi
\wedge \xi \zeta \vartheta \varsigma \varphi
\aleph \oplus \otimes \wp \prime \emptyset
\angle \neg \clubsuit \diamondsuit \spadesuit
\cdot \lfloor \lceil \rceil \rfloor

Click here to see the
symbols and their names.
For example, you might use these as follows:
draw title "$\alpha$ = thermal expansion coefficient"

Sometimes you'll want a mathematical symbol to be adjacent to a normal
text string, with no space between. You can do this by enclosing in
braces, as in LaTeX.
TeX and LaTeX handle combinations of superscripts and subscripts
very cleanly, putting one above the other. Presently, Gri does not do
this; for example `set x name "$A_1^2$" ' will have the 2 appearing
to the right of the 1 instead of above it. Proper positioning will be
added to a later version of Gri, but in the meantime you can achieve the
desired effect with the TeX ``negative thinspace'' psuedocharacter
in mathmode. Using this feature will not hurt you when the new Gri
becomes available. The symbol for a negative thinspace is `\! ' in
mathmode. It has no meaning in nonmath mode. A thinspace is 1/6 of an
``emspace'' (a TeX term, normally equal to the width of the
character ``M'' in the current font). In most fonts, numbers are half
the width of the letter ``M'', so that 3 negative thinspaces will move
leftward over a single number. Thus, if the example above becomes
`set x name "$A_1\!\!\!^2" ', the 2 will be positioned above the 1.
(Equivalently, you could write `set x name "$A^2\!\!_1$" '.)
Depending on the actual characters you have in the super/subscripts, you
might need more or less thinspaces; some experimentation might be
required. Also, note that the symbol `\, ' in math mode is a
positive thinspace (which moves the next character a little bit to the
right). Thus, you can add a little extra spaces between characters by
doing something like `set x name "A$\,$B" '.
To get a hat over a single character, do something like the following
(which draws a hat over the character "h"):
draw label "h${\!\!\!^{^\wedge}}$" at 10 12 cm

To get an overbar on a rho, do this:
draw label "$\rho\!\!\!\!^$" at 3 3 cm

