Difference between revisions of "Math/fractions"
Line 76: | Line 76: | ||
{\getbuffer[frac]} | {\getbuffer[frac]} | ||
{\getbuffer[frac]}}} | {\getbuffer[frac]}}} | ||
+ | </context> | ||
+ | |||
+ | == Formatting with {{cmd|definemathfraction} == | ||
+ | |||
+ | Just an example from [https://www.mail-archive.com/ntg-context@ntg.nl/msg69987.html] | ||
+ | |||
+ | <context source="yes"> | ||
+ | \definemathfraction | ||
+ | [wfrac] | ||
+ | [margin=.25em] | ||
+ | |||
+ | \startformula | ||
+ | \wfrac {a} { \frac{b}{c} } | ||
+ | \stopformula | ||
</context> | </context> | ||
Revision as of 18:45, 12 May 2024
Contents
Fractions
\frac typeset fraction, according to the current style. Others commands enforce a certain style :
- \tfrac for text style
- \dfrac for display style
- \xfrac for script style.
- \sfrac and \xxfrac for script of script style.
- \cfrac for continued style
- \vfrac for semi-horizontal style
- \hfrac for horizontal style
\starttabulate[|l|l|l|] \HL \NC {\bf Size or style} \NC {\bf Code} \NC {\bf Typesetting} \NC\NR \HL \NC math \NC \type{\frac{1}{3}} \NC \m{\frac{1}{3}} \NC\NR \NC display \NC \type{\dfrac{1}{3}} \NC \m{\dfrac{1}{3}} \NC\NR \NC script \NC \type{\xfrac{1}{3}} \NC \m{\xfrac{1}{3}} \NC\NR \NC scriptscript \NC \type{\sfrac{1}{3}} \NC \m{\sfrac{1}{3}} \NC\NR \NC scriptscript \NC \type{\xxfrac{1}{3}} \NC \m{\xxfrac{1}{3}} \NC\NR \NC semi-horizontal \NC \type{\vfrac{1}{3}} \NC \m{\vfrac{1}{3}} \NC\NR \NC horizontal \NC \type{\hfrac{1}{3}} \NC \m{\hfrac{1}{3}} \NC\NR \NC continued \NC \type{\cfrac{1}{3}} \NC \m{\cfrac{1}{3}} \NC\NR \NC text \NC \type{\tfrac{1}{3}} \NC \m{\tfrac{1}{3}} \NC\NR \stoptabulate
Different behaviors for inline and display mode
\startbuffer[frac] \frac{1}{2} + \dfrac{1}{2} - \sfrac{1}{2} - \xfrac{1}{2} - \xxfrac{1}{2} + \vfrac{1}{2} + \hfrac{1}{2} + \tfrac{1}{2} \stopbuffer \framed[frame=off,align=normal]{% <=== just to improve wiki rendering Each time, we display the different style: With \tex{startformula} (display mode) \startformula \getbuffer[frac] \stopformula With \tex{m} (inline mode): \m{\getbuffer[frac]}}
Fractions of fractions
\startbuffer[frac] \frac{1}{2} + \dfrac{1}{2} - \sfrac{1}{2} - \xfrac{1}{2} - \xxfrac{1}{2} + \vfrac{1}{2} + \hfrac{1}{2} + \tfrac{1}{2} \stopbuffer \framed[frame=off,align=normal]{% <=== just to improve wiki rendering Now fraction of fractions: With \tex{startformula} (display mode) \startformula \frac {\getbuffer[frac]} {\getbuffer[frac]} \stopformula With \tex{m} (inline mode) and \tex{frac}: \m{\frac {\getbuffer[frac]} {\getbuffer[frac]}} With \tex{m} (inline mode) and \tex{cfrac} (continued): \m{\cfrac {\getbuffer[frac]} {\getbuffer[frac]}}}
Formatting with {{cmd|definemathfraction}
Just an example from [1]
\definemathfraction [wfrac] [margin=.25em] \startformula \wfrac {a} { \frac{b}{c} } \stopformula
Binomial coefficients
To write binomial coefficients you use any of \binom, \tbinom or \dbinom (the latter two if you want to force text style or display style respectively). These commands are defined as fractions in ConTeXt, and can be set up with \setupmathfractions.
The default look of the binomial coefficients look good in several fonts, but for example not perfect in Latin Modern. You can play with \setupmathfractions, and in particular, you can try
\setupmathfractions[binomial][ fences=parenthesis, %threshold=1.5, ]
Below we show some of the often used fonts, together with the default setting and the one just suggested. You can also play with the threshold key.
\setuphead[chapter][align=middle] \setuphead[section][style=\bfa] \setuphead[subsection][style=\it] \setuplayout[ topspace=1in, bottomspace=1in, header=0pt, footer=0pt, backspace=1in, margin=0pt, width=fit, height=fit, ] \startbuffer \type{\binom{n}{k}}: $\binom{n}{k}$\par \type{\tbinom{n}{k}}: $\tbinom{n}{k}$\par \type{\dbinom{n}{k}}: $\dbinom{n}{k}$\par \stopbuffer \starttext \title{Binomial coefficients} \startcolumns[n=2] \subject{Default settings} \subsubject{Latin Modern} \getbuffer \switchtobodyfont[pagella] \subsubject{Pagella} \getbuffer \switchtobodyfont[stixtwo] \subsubject{STIX Two} \getbuffer %\switchtobodyfont[lucidaot] %\subsubject{Lucida} %\getbuffer \column[yes] \setupmathfractions[binom][ fences=parenthesis, ] \switchtobodyfont[modern] \subject{With fences=parenthesis} \subsubject{Latin Modern} \getbuffer \switchtobodyfont[pagella] \subsubject{Pagella} \getbuffer \switchtobodyfont[stixtwo] \subsubject{STIX Two} \getbuffer %\switchtobodyfont[lucidaot] %\subsubject{Lucida} %\getbuffer \stopcolumns \stoptext
The result of the code above, with the standalone from 2017-09-05 is given below.