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|
\environment math-layout
\startcomponent math-alignments
\startchapter[title=Alignments and such]
\startsection[title=Using ampersands]
When you come from plain \TEX, using ampersands probably comes as a custom, like in:
\startbuffer
\startformula
\bordermatrix {
a & b & c & d \cr
e & f & G & h \cr
i & j & k & l \cr
}
\stopformula
\stopbuffer
\typebuffer \getbuffer
or:
\startbuffer
\startformula
\bbordermatrix {
a & b & c & d \cr
e & f & G & h \cr
i & j & k & l \cr
}
\stopformula
\stopbuffer
\typebuffer \getbuffer
A more \CONTEXT\ way is this:
\startbuffer
\startformula
\startbordermatrix
\NC a \NC b \NC c \NC d \NR
\NC e \NC f \NC G \NC h \NR
\NC i \NC j \NC k \NC l \NR
\stopbordermatrix
\stopformula
\stopbuffer
\typebuffer \getbuffer
and:
\startbuffer
\startformula
\startbbordermatrix
\NC a \NC b \NC c \NC d \NR
\NC e \NC f \NC G \NC h \NR
\NC i \NC j \NC k \NC l \NR
\stopbbordermatrix
\stopformula
\stopbuffer
\typebuffer \getbuffer
Just that you know. In general ampersands in \CONTEXT\ text mode are just that:
ampersands, not something alignment related.
\stopsection
\startsection[title=Locations]
The \type {location} feature gives some control over the alignment of alignments.
The following examples are taken from an email exchange with Henri Menke.
\startbuffer
\startplaceformula
\startformula
\startmathalignment[location=top]
\NC a + b \NC= c + d \NR
\NC a + b \NC= c + d \NR
\NC a + b \NC= c + d \NR
\stopmathalignment
\quad\text{or}\quad
\startmathalignment[location=center]
\NC a + b \NC= c + d \NR
\NC a + b \NC= c + d \NR
\NC a + b \NC= c + d \NR
\stopmathalignment
\quad\text{or}\quad
\startmathalignment[location=bottom]
\NC a + b \NC= c + d \NR
\NC a + b \NC= c + d \NR
\NC a + b \NC= c + d \NR
\stopmathalignment
\stopformula
\stopplaceformula
\stopbuffer
\typebuffer \getbuffer
Numbering works ok for a single mathalignment
\startbuffer
\startplaceformula
\startformula
\startmathalignment[number=auto]
\NC a + b \NC= c + d \NR
\NC a + b \NC= c + d \NR
\NC a + b \NC= c + d \NR
\stopmathalignment
\stopformula
\stopplaceformula
\stopbuffer
\typebuffer \getbuffer
But for one with a location the results are suboptimal:
\startbuffer
\startplaceformula
\startformula
\startmathalignment[location=center,number=auto]
\NC a + b \NC= c + d \NR
\NC a + b \NC= c + d \NR
\NC a + b \NC= c + d \NR
\stopmathalignment
\stopformula
\stopplaceformula
\stopbuffer
\typebuffer \getbuffer
Here is a real example:
\startbuffer
\startplaceformula
\startformula
U_2 = \frac{1}{2!}
\int_0^\beta \diff\tau_1 \int_0^\beta \diff\tau_2\;
\sum_{\startsubstack k_1,q_1 \NR k_2,q_2 \stopsubstack}
\Bigl\langle
\startmathalignment[location=top,align=left]
\NC
\mathcal T \Bigl[
c_{k_1}^\dagger (\tau_1)
\Delta_{k_1,q_1}^r c_{-k_1}^* (\tau_1) + c_{-q_1}^T (\tau_1)
\Delta_{k_1,q_1}^{r\dagger} c_{q_1} (\tau_1)
\Bigr]
\NR
\NC
\times \Bigl[
c_{k_2}^\dagger(\tau_2) \Delta_{k_2,q_2}^r c_{-k_2}^*
(\tau_2) + c_{-q_2}^T (\tau_2) \Delta_{k_2,q_2}^{r\dagger}
c_{q_2} (\tau_2)
\Bigr] \Bigr\rangle .
\NR
\stopmathalignment
\stopformula
\stopplaceformula
\stopbuffer
\typebuffer \getbuffer
\stopsection
\startsection[title=Tuning alignments]
Again a few examples of manipulating alignments. It really helps to play
with examples if you want to get an idea what is possible.
\startbuffer
\startformula
\startalign[m=2,align={middle}]
\NC \text to 6cm{} \NC x = 0 \NR
\stopalign
\stopformula
\startformula
\startalign[m=2,align={middle}]
\NC \text to 6cm{One\hfill} \NC a = 1 \NR
\NC \text to 6cm{One Two\hfill} \NC b = 2 \NR
\NC \text to 6cm{One Two Three\hfill} \NC c = 3 \NR
\stopalign
\stopformula
\startformula
\startalign[m=2,align={left}]
\NC \text to 6cm{One\hfill} \NC a = 1 \NR
\NC \text to 6cm{One Two\hfill} \NC b = 2 \NR
\NC \text to 6cm{One Two Three\hfill} \NC c = 3 \NR
\stopalign
\stopformula
\stopbuffer
\typebuffer \getbuffer
\startbuffer
\startformula
\startalign[m=2,align={middle}]
\NC \text to 6cm{} \NC x = 0 \NR
\stopalign
\stopformula
\startformula
\startalign[m=2,align={middle}]
\NC \text to 6cm{One} \NC a = 1 \NR
\NC \text to 6cm{One Two} \NC b = 2 \NR
\NC \text to 6cm{One Two Three} \NC c = 3 \NR
\stopalign
\stopformula
\startformula
\startalign[m=2,align={left}]
\NC \text to 6cm{One} \NC a = 1 \NR
\NC \text to 6cm{One Two} \NC b = 2 \NR
\NC \text to 6cm{One Two Three} \NC c = 3 \NR
\stopalign
\stopformula
\stopbuffer
\typebuffer \getbuffer
\startbuffer
\startformula
\startalign[m=2,align={middle}]
\NC \text{} \NC x = 0 \NR
\stopalign
\stopformula
\startformula
\startalign[m=2,align={middle}]
\NC \text{One} \NC a = 1 \NR
\NC \text{One Two} \NC b = 2 \NR
\NC \text{One Two Three} \NC c = 3 \NR
\stopalign
\stopformula
\startformula
\startalign[m=2,align={left}]
\NC \text{One} \NC a = 1 \NR
\NC \text{One Two} \NC b = 2 \NR
\NC \text{One Two Three} \NC c = 3 \NR
\stopalign
\stopformula
\stopbuffer
\typebuffer \getbuffer
\stopsection
\startsection[title={Splitting over pages}]
Because formula placement has positioning options a formula gets
wrapped in a box. As a consequence formulas will not break across
pages. This can be an issue with alignments. There is an experimental
option for this (the result is shown in \in {figure} [fig:splitalign]):
\startbuffer[demo]
\usemodule[art-01]
\setupbodyfont[13pt]
\starttext
\input tufte
\startplaceformula
\startsplitformula
\startalign
\NC a \EQ b \NR[+]
\NC \EQ d \NR
\NC c \EQ f \NR[+]
\NC \EQ g \NR
\NC \EQ h \NR[+]
\dorecurse{100}{\NC \EQ i + #1 - #1\NR[+]}%
\NC \EQ x \NR
\stopalign
\stopsplitformula
\stopplaceformula
\input tufte
\stoptext
\stopbuffer
\typebuffer[demo]
\startplacefigure[title={Splitting an alignment.},reference=fig:splitalign]
\startcombination[nx=4,ny=1]
{\typesetbuffer[demo][page=1,width=\measure{combination}]} {}
{\typesetbuffer[demo][page=2,width=\measure{combination}]} {}
{\typesetbuffer[demo][page=3,width=\measure{combination}]} {}
{\typesetbuffer[demo][page=4,width=\measure{combination}]} {}
\stopcombination
\stopplacefigure
\stoptext
\stopsection
\stopchapter
\stopcomponent
|
