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| − | < [[Main Page]] | [[Math]] | [[Math with newmat]] | [[MathML]] >
| + | moved to [[Math/Multiline_equations]] |
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| − | Be sure to also read [http://dl.contextgarden.net/myway/mathalign.pdf Using \startalign and friends] written by Aditya Mahajan.
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| − | = Basic Alignment with {{cmd|startalign}} =
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| − | <context source=yes>
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| − | \startformula\startalign
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| − | \NC v \NC = u + at \NR
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| − | \NC h \NC = ut + \frac12 gt^2 \NR
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| − | \stopalign\stopformula
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| − | </context>
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| − | {{cmd|NC}} stands for new column, {{cmd|NR}} stands for new row.
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| − | = Changing the number of columns =
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| − | The above equations were aligned at <code>=</code>. Suppose you also want the <code>+</code> to align. Well, this is simple in context, simply specify the number of columns with <code>\startalign</code>
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| − | <context source=yes>
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| − | \startformula \startalign[n=3]
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| − | \NC v \NC = u \NC + at \NR
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| − | \NC h \NC = ut \NC + \frac12 gt^2 \NR
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| − | \stopalign \stopformula
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| − | </context>
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| − | = Equation numbering with {{cmd|startplaceformula}} =
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| − | Aligned equations can be numbered by using {{cmd|startplaceformula}} (as usual), and by placing a tag after {{cmd|NR}}
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| − | <context source=yes>
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| − | \setuplayout[scale=0.8,width=13cm]
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| − | \startplaceformula
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| − | \startformula \startalign
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| − | \NC v \NC = u + at \NR[eq:v]
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| − | \NC h \NC = ut + \frac12 gt^2 \NR[eq:h]
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| − | \stopalign \stopformula
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| − | \stopplaceformula
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| − | Equation~(\in[eq:v]) tells the final velocity after time~$t$ and equation~(\in[eq:h]) tells the distance travelled in time~$t$.
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| − | </context>
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| − | == Sub-numbering with {{cmd|startsubformulas}} ==
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| − | The numbering can be changed to a subformula style by encapsulating {{cmd|startplaceformula}} with {{cmd|startsubformulas}} :
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| − | <context source=yes>
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| − | \setuplayout[scale=0.8,width=13cm]
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| − | \startsubformulas[eq:total]
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| − | \startplaceformula
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| − | \startformula \startalign
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| − | \NC v \NC = u + at \NR[eq:v]
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| − | \NC h \NC = ut + \frac12 gt^2 \NR[eq:h]
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| − | \stopalign \stopformula
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| − | \stopplaceformula
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| − | \stopsubformulas
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| − | In~(\in[eq:total]), equation~(\in[eq:v]) tells the final velocity after time~$t$ and equation (\in[eq:h]) tells the distance travelled in time~$t$.
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| − | </context>
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| − | = Specifying and defining alignment with {{cmd|definemathalignment}} =
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| − | If you want more control over the formatting, and want the middle column to be center aligned, you can do that by
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| − | <context source=yes>
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| − | \startformula \startalign[n=3,align={1:right,2:middle,3:left}]
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| − | \NC v \NC = u \NC+ at \NR
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| − | \NC h \NC= ut \NC+ \frac12 gt^2 \NR
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| − | \stopalign \stopformula
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| − | </context>
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| − | This mechanism allows fancier alignments like
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| − | <context source=yes>
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| − | \startformula \startalign[n=4,align={1:right,2:right,3:middle,4:left}]
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| − | \NC \text{We have} \quad \NC v \NC = u \NC+ at \NR
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| − | \NC \text{and} \quad \NC h \NC= ut \NC+ \frac12 gt^2 \NR
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| − | \stopalign \stopformula
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| − | </context>
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| − | These kind of new alignment can be defined using {{cmd|definemathalignment}}.
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| − | <context source=yes>
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| − | \definemathalignment
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| − | [demom]
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| − | [n=4,align={1:right,2:right,3:middle,4:left}]
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| − | \startformula \startdemom
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| − | \NC \text{We have} \quad \NC v \NC = u \NC+ at \NR
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| − | \NC \text{and} \quad \NC h \NC= ut \NC+ \frac12 gt^2 \NR
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| − | \stopdemom \stopformula
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| − | </context>
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| − | A second example, to emulate <code>gather</code> environment of amsmath, we can use
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| − | <context source=yes>
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| − | \definemathalignment
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| − | [gather]
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| − | [n=1,align={1:middle}]
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| − | \startformula \startgather
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| − | \NC ax^2 + bx + c = 0 \NR
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| − | \NC \text{roots} = \frac{ -b \pm \sqrt{b^2 - 4ac}}{2a} \NR
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| − | \stopgather \stopformula
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| − | </context>
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| − | = Cases =
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| − | Context provides a {{cmd|startmathcases}} {{cmd|stopmathcases}} pair to make it easy to get cases.
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| − | <context source=yes text="gives">
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| − | \startformula
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| − | \delta_{ij} =
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| − | \startmathcases
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| − | \NC 1 \NC \text{if } i = j \NR
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| − | \NC 0 \NC \text{otherwise} \NR
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| − | \stopmathcases
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| − | \stopformula
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| − | </context>
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| − | The cases environment consists of two columns, separated by {{cmd|NC}}. The second column is by default in math mode. To typeset the second column in text mode, use {{cmd|TC}}
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| − | <texcode>
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| − | \startformula
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| − | \delta_{ij} =
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| − | \startmathcases
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| − | \NC 1 \TC if \m{i = j} \NR
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| − | \NC 0 \TC otherwise \NR
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| − | \stopmathcases
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| − | \stopformula
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| − | </texcode>
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| − | Each line must end with a {{cmd|NR}}.
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| − | There are several built-in commands for displaying mathematical formulas. For instance
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| − | <texcode>
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| − | \startcases, \stopcases
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| − | \startmathmatrix, \stopmathmatrix
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| − | \startalign,\stopalign
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| − | </texcode>
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| − | Each has its own advantage and can be customized: for a thorough understanding of these commands please
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| − | refer to Aditya Mohajan's excellent user's guide
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| − | [https://wiki.contextgarden.net/images/archive/b/b4/20100530075041!Mathalign.pdf Using \startalign and friends].
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| − | These commands can be found in [[source:core-mat.tex|core-mat.tex]] file, which contains
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| − | most of the core ConTeXt math macros.
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| − | <context source="yes">
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| − | This is an example of aligned equations:
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| − | \startformula
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| − | \startcases[align={right,left},distance=3pt]
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| − | \NC 2x + 3y \NC{} = 10 \NR
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| − | \NC 3x + 2y \NC{} = 5, \NR
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| − | \stopcases
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| − | \stopformula
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| − | and this is another one:
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| − | \startformula
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| − | \startmatrix[align={right,left},distance=3pt,left={\left\{}, right={\right.}]
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| − | \NC 2x + 3y \NC{} = 10 \NR
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| − | \NC 3x + 2y \NC{} = 5 \NR
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| − | \stopmatrix
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| − | \stopformula
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| − | </context>
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| − | In these structures it is important (well, in the above example it is not important and the result is the same, but I have been told that it is necessary in some other situations...) to notice that the sign "=" is preceded by "\NC{}, since
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| − | otherwise that sign would be considered as a binary operator and the alignment would be
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| − | disturbed (at least this is what I guess…Otared K.).
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| − | One of the powerful structures in displaying mathematical formulas is the possibility of defining custom maths alignment.
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| − | For instance the following definition
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| − | <texcode>
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| − | \definemathmatrix[alignedcases]
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| − | [align={right,left,left},
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| − | distance=3pt,
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| − | left={\left\{},
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| − | right={\right.},
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| − | style=\displaystyle]
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| − | </texcode>
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| − | creates two new commands,
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| − | <texcode>
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| − | \startalignedcases, \stopalignedcases:
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| − | </texcode>
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| − | after which one may use them in a displayed formula as follows:
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| − | <texcode>
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| − | The following formula is displayed in two lines with an appropriate alignment of the equations:
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| − | \startformula
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| − | \startalignedcases
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| − | \NC -\Delta u + g(u) \NC{} = f \NC \quad\mbox{in } \Omega\NR
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| − | \NC {\partial u \over \partial {\bf n} } \NC{} = h(u) \NC \quad\mbox{on } \partial\Omega \NR
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| − | \stopalignedcases
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| − | \stopformula
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| − | </texcode>
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| − | <context>
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| − | \definemathmatrix[alignedcases]
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| − | [align={right,left,left},
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| − | distance=3pt,
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| − | left={\left\{},
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| − | right={\right.},
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| − | style=\displaystyle]
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| − | The following formula is displayed in two lines with an appropriate alignment of the equations:
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| − | \startformula
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| − | \startalignedcases
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| − | \NC -\Delta u + g(u) \NC{} = f \NC \quad\mbox{in } \Omega\NR
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| − | \NC {\partial u \over \partial {\bf n} } \NC{} = h(u) \NC \quad\mbox{on } \partial\Omega \NR
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| − | \stopalignedcases
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| − | \stopformula
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| − | </context>
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| − | [[Category:Math]]
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| − | = Numbered Cases =
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| − | [[Category:Math]]
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