[Octave-bug-tracker] [bug #42582] some TeX symbols don't work on-screen (fltk)

[Hartmut]

Follow-up Comment #8, bug #42582 (project octave):

I have had a look what symbols TeX supports [1] and are not currently
implemented in Octave [2]. From those I've picked the ones I personally have
seen in scientific plots and consider them useful myself. So here is my
suggested (and maybe very personal) list:


*** My personal wish list: ***
\varepsilon  (useful and common for any kind of formulas)
\varrho      (useful and common for any kind of formulas)
\varphi      (useful and common for any kind of formulas)
\hbar        (useful for Physics stuff)
\sqrt        (is this doable without excessiv effort?)
\sum         (but there is already \Sigma)
\prod        (but there is already \Pi)
\ominus      (because there is already \oplus in Octave)
\odot        (because there is already \otimes in Octave)
\ll          (this looks more professional as <<)
\gg          (this looks more professional as >>)
\parallel    (because there is already \perp in Octave)
\simeq       (currently there is only \sim in Octave)
\notin       (currently there seem to be no negationas at all in Octave,
except for \neq)
\not=        (even if there is already \neq in Octave)
\Leftrightarrow      (currently there is only \leftrightarrow in Octave)
\mapsto      (useful arrow type for Math)
\rightleftharpoons   (useful for chemical stuff)
\Uparrow     (currently there is only \uparrow in Octave)
\Downarrow   (currently there is only \uparrow in Octave)

(alternate names for already existing TeX symbols in Octave:)
\le
\ge
\to
\gets
\owns
\land
\lor
\lnot


[1] http://www.math.union.edu/~dpvc/jsmath/symbols/welcome.html
This webpage claims to list „The symbols listed in Appendix F of The
TeXbook“

[2]
https://www.gnu.org/software/octave/doc/interpreter/Use-of-the-interpreter-Property.html

Here is the full list of TeX symbols in [1] which are not yet in Octave [2]
(leftout stuff is marked with square brackets):


*** Full list of possibly missing TeX symbols ***
Greek Letters
\varepsilon
\varrho
\varphi


Symbols of type Ord
\hbar
\imath
\jmath
\ell
\emptyset     (there is alreaddy \O )
\top
\bot
\|
\triangle      (there is already \Delta )
\backslash
\flat
\natural
\sharp

\cdots
\vdots
\ddots


Functions
[…]
\sqrt        (is this doable without excessiv effort?)
\root 3\of


"Large" Operators
\sum       (but there is already \Sigma)
\prod      (but there is already \Pi)
\coprod
\oint
\bigcap
\bigcup
\bigsqcup
\bigvee
\bigwedge
\bigodot
\bigotimes
\bigoplus
\biguplu


Binary operations
\mp
\setminus
\star
\diamond
\uplus
\sqcap
\sqcup
\triangleleft
\triangleright
\wr
\bigcirc
\bigtriangleup
\bigtriangledown
\ominus      (because there is already \oplus in Octave)
\odot        (because there is already \otimes in Octave)
\dagger
\ddagger
\amalg


Relations and their Negations
\prec
\preceq
\ll         (this looks more professional as <<)
\sqsubseteq
\vdash
\smile
\frown
\succ
\succeq
\gg         (this looks more professional as >>)
\sqsupseteq
\dashv
\parallel   (because there is already \perp in Octave)
\simeq      (currently there is only \sim in Octave)
\asymp
\bowtie
\models
\doteq

\not<
\not\leq
\not\preceq
\not\subset
\not\subseteq
\not\sqsubseteq
\not>
\not\geq
\not\succ
\not\succeq
\not\supset
\not\supseteq
\not\sqsupseteq
\notin        (currently there seem to be no negationas at all in Octave,
except for \neq)
\not=         (even if there is already \neq in Octave)
\not\equiv
\not\sim
\not\simeq
\not\approx
\not\cong
\not\asymp


Arrows
\Leftrightarrow   (currently there is only \leftrightarrow in Octave)
\mapsto           (useful arrow type for Math)
\hookleftarrow
\leftharpoonup
\leftharpoondown
\rightleftharpoons   (useful for chemical stuff)
\longleftarrow
\Longleftarrow
\longrightarrow
\Longrightarrow
\longleftrightarrow
\Longleftrightarrow
\longmapsto
\hookrightarrow
\rightharpoonup
\rightharpoondown
\Uparrow            (currently there is only \uparrow in Octave)
\Downarrow          (currently there is only \uparrow in Octave)
\updownarrow
\Updownarrow
\nearrow
\searrow
\swarrow
nwarrow


Delimiters
[…]

Matrices and Arrays
[…]

Alternate Names and Non-Math Symbols
\le
\ge
\{
\}
\to
\gets
\owns
\land
\lor
\lnot
|
\|
\dagger
\ddagger


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