IDL : subscripts/superscripts

Changing Fonts within a String, special fonts

You can change fonts one or more times within a text string using the embedded font commands shown in the table below. The character following the exclamation mark can be either upper or lower case.

Examples of commands used to change fonts in mid-string are included in Formatting Command Examples.

Table H-33: Embedded Font Selection Commands

Table H-33: Embedded Font Selection Commands

Command	Hershey Vector Font	TrueType Font	PostScript Font
!3	Simplex Roman (default)	Helvetica	Helvetica
!4	Simplex Greek	Helvetica Bold	Helvetica Bold
!5	Duplex Roman	Helvetica Italic	Helvetica Narrow
!6	Complex Roman	Helvetica Bold Italic	Helvetica Narrow Bold Oblique
!7	Complex Greek	Times	Times Roman
!8	Complex Italic	Times Italic	Times Bold Italic
!9	Math/special characters	Symbol	Symbol
!M	Math/special characters (change effective for one character only)	Symbol	Symbol
!10	Special characters	Symbol *	Zapf Dingbats
!11(!G)	Gothic English	Courier	Courier
!12(!W)	Simplex Script	Courier Italic	Courier Oblique
!13	Complex Script	Courier Bold	Palatino
!14	Gothic Italian	Courier Bold Italic	Palatino Italic
!15	Gothic German	Times Bold	Palatino Bold
!16	Cyrillic	Times Bold Italic	Palatino Bold Italic
!17	Triplex Roman	Helvetica *	Avant Garde Book
!18	Triplex Italic	Helvetica *	New Century Schoolbook
!19		Helvetica *	New Century Schoolbook Bold
!20	Miscellaneous	Helvetica *	Undefined User Font
!X	Revert to the entry font	Revert to the entry font	Revert to the entry font
* The font assigned to this index may be replaced in a future release of IDL.

Writing Exponents :

IDL> xyouts, 0.5, 200, '!6E=mc!E2' On the plot, the string will reads: E = mc²

Positioning Commands	Action
!A	Shift above the division line.
!B	Shift below the divisionline.
!C	"Carriage return," begins a new line of text. Shift back to the starting position and down one line.
!D	Shift down to the first level subscript and decrease the character size by a factor of 0.62.
!E	Shift up to the exponent level and decrease the character size by a factor of 0.44.
!I	Shift down to the index level and decrease the character size by a factor of 0.44.
!L	Shift down to the second level subscript. Decrease the character size by a factor of 0.62.
!N	Shift back to the normal level and original character size.
!R	Restore position. The current position is set from the top of the saved position stack.
!S	Save position. The currente position is saved on the top of the saved positions stack.
!U	Shift to upper subscript level. Decrease the character size by a factor of 0.62.
!X	Return to the entry font.
!!	Display the ! symbol.

 ^{To change to special characters: '!9'+string(#B)+'!X'}

Look up number from:^{https://www.harrisgeospatial.com/docs/using_truetype_fonts.html}

^{e.g. for integral sign in title:} title='!9'+string(242B)+'!X'

Note: use !p.font=0 for post script

^{Further descripton:}http://tinyurl.com/64sv245

Solar mass Sun symbol: 'Mass (M/M'+sunsymbol(font=0)+')'

Overbar on characters: 

TITLE='My Data !9`!S``!R!XAB'

Gives an overbar over AB. title='My Data !9`!S``!R!XV!Dr!U2!N!X A'

 gives an overbar over Vr^2 leaving out A