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<texcode>
\startformula \startalign
v &= u + at \\
h &= ut + \frac12 gt^2 \\
\stopalign \stopformula
</texcode>
Note the \\ in the last line, above.
<texcode>
\startformula \startalign[n=3,align={right,middle,left}]
\NC v \NC = u \NC+ at \NR
\NC h \NC= ut \NC+ \frac12 gt^2 \NR
\stopalign \stopformula
</texcode>
\startformula \startgather \NC ax^2 + bx + c = 0 \NR \NC \text{roots} = \frac{ -b \pm \sqrt{b^2 - 4ac}}{2a} \NR\stopgather \stopformula</texcode> <contextsource=yes>
givesThe cases environment consists of two columns, separated by {{cmd|NC}}. The second column is by default in text mode. An alternative way of getting the same result is to define the second column as a mathcolumn with {{cmd|MC}} like so:
The cases environment consists of two columns, separated by <cmd>NC</cmd>. The second column is by default in text mode. Each line must end with a <{{cmd>|NR</cmd>}}.
Add ties (non-breaking spaces) before equation numbers and variable names.
< [[Main Page]] | [[Math]] | [[Math with newmat]] | [[MathML]] >
Be sure to also read [http://dl.contextgarden.net/myway/mathalign.pdf Using \startalign and friends] written by Aditya Mahajan.
== Basic Alignment ==
* Latex style
<context source=yes text="Note the \\ in the last line, above. This appears as follows: <context">
\startformula \startalign
v &= u + at \\
* Context Style
<texcode>\startformula \startalign \NC v \NC context source= u + at \NR \NC h \NC= ut + \frac12 gt^2 \NR\stopalign \stopformula</texcode> <contextyes>
\startformula \startalign
\NC v \NC = u + at \NR
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>
<texcode>\startformula \startalign[n=3] \NC v \NC = u \NC+ at \NR \NC h \NCcontext source= ut \NC+ \frac12 gt^2 \NR\stopalign \stopformula</texcode> <contextyes>
\startformula \startalign[n=3]
\NC v \NC = u \NC+ at \NR
== Alignment of each column ==
If you want more control over the formatting, and want the middle column to be center aligned, you can do that by
<contextsource=yes>
\startformula \startalign[n=3,align={right,middle,left}]
\NC v \NC = u \NC+ at \NR
This mechanism allows fancier alignments like
<texcode>\startformula \startalign[ncontext source=4,align={left,right,middle,left}] \NC \text{We have} \quad \NC v \NC = u \NC+ at \NR \NC \text{and} \NC h \NC= ut \NC+ \frac12 gt^2 \NR\stopalign \stopformula</texcode> <contextyes>
\startformula \startalign[n=4,align={left,right,middle,left}]
\NC \text{We have} \quad \NC v \NC = u \NC+ at \NR
== Working with equation numbering ==
aligned equations can be numbered by placing a tag after <{{cmd>|NR</cmd>}}
<texcodecontext source=yes>\setuplayout[scale=0.8,width=13cm]
\placeformula \startformula \startalign
\NC v \NC = u + at \NR[eq:v]
\NC h \NC = ut + \frac12 gt^2 \NR[eq:h]
\stopalign \stopformulaEquation ~(\in[eq:v]) tells the final velocity after time ~$t$ and equation ~(\in[eq:h]) tells the distance travelled in time ~$t$.</texcodecontext> The numbering can be changed to a subformula style using {{cmd|placesubformula}} instead of {{cmd|placeformula}} and numbering the subformulas using {{cmd|NR|2=[+][a]}}, {{cmd|NR|2=[+][b]}}, … instead:
<contextsource=yes>
\setuplayout[scale=0.8,width=13cm]
\placeformula placesubformula \startformula \startalign \NC v \NC = u + at \NR[+][eq:v] \NC h \NC = ut + \frac12 gt^2 \NR[+][eq:h]
\stopalign \stopformula
Equation ~(\in[eq:v]) tells the final velocity after time ~$t$ and equation (\in[eq:h]) tells the distance travelled in time ~$t$.
</context>
== Defining new alignment structures ==
New alignment can be defined using <{{cmd>|definemathalignment</cmd>}}. For example, to emulate <code>gather</code> environment of amsmath, we can use<texcode>\definemathalignment [gather] [n=1,align={middle}]
\definemathalignment
[gather]
== Cases ==
Context provides a <{{cmd>|startmathcases</cmd> <}} {{cmd>|stopmathcases</cmd> }} pair to make it easy to get cases. <texcodecontext source=yes text="gives">
\startformula
f(x) = \startmathcases
\stopmathcases
\stopformula
</texcodecontext>
<contexttexcode>
\startformula
f(x) = \startmathcases
\NC x, \NC MC \text{if $} 0 \le x \le \frac12$ \NR \NC 1-x ,\NC MC \text{if $} \frac12 \le x \le 1$ \NR
\stopmathcases
\stopformula
</contexttexcode>
== Numbered Cases ==
[[Category:Math]]
