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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 ==
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| − | Two modes of input
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| − | * Latex style
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| − | <texcode>
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| − | \startformula \startalign
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| − | v &= u + at \\
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| − | h &= ut + \frac12 gt^2 \\
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| − | \stopalign \stopformula
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| − | </texcode>
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| − | Note the \\ in the last line, above.
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| − | This appears as follows:
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| − | <context>
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| − | \startformula \startalign
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| − | v &= u + at \\
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| − | h &= ut + \frac12 gt^2 \\
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| − | \stopalign \stopformula
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| − | </context>
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| − | * Context Style
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| − | <texcode>
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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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| − | </texcode>
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| − | | |
| − | <context>
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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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| − | (The examples here will focus on the context style, having two styles can be confusing --[[User:Adityam| Aditya ]] )
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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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| − | <texcode>
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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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| − | </texcode>
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| − | | |
| − | <context>
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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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| − | | |
| − | == Alignment of each column ==
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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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| − | <texcode>
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| − | \startformula \startalign[n=3,align={right,middle,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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| − | </texcode>
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| − | | |
| − | <context>
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| − | \startformula \startalign[n=3,align={right,middle,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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| − | | |
| − | <texcode>
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| − | \startformula \startalign[n=4,align={left,right,middle,left}]
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| − | \NC \text{We have} \quad \NC v \NC = u \NC+ at \NR
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| − | \NC \text{and} \NC h \NC= ut \NC+ \frac12 gt^2 \NR
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| − | \stopalign \stopformula
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| − | </texcode>
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| − | | |
| − | <context>
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| − | \startformula \startalign[n=4,align={left,right,middle,left}]
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| − | \NC \text{We have} \quad \NC v \NC = u \NC+ at \NR
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| − | \NC \text{and} \NC h \NC= ut \NC+ \frac12 gt^2 \NR
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| − | \stopalign \stopformula
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| − | </context>
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| − | | |
| − | == Working with equation numbering ==
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| − | aligned equations can be numbered by placing a tag after {{cmd|NR}}
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| − | <texcode>
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| − | \placeformula \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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| − | Equation (\in[eq:v]) tells the final velocity after
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| − | time $t$ and equation (\in[eq:h]) tells the distance
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| − | travelled in time $t$.
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| − | </texcode>
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| − | <context>
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| − | \setuplayout[scale=0.8,width=13cm]
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| − | \placeformula \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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| − | 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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| − | == Changing the number of columns ==
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| − | == Defining new alignment structures ==
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| − | New alignment can be defined using {{cmd|definemathalignment}}. For example, to emulate <code>gather</code> environment of amsmath, we can use
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| − | <texcode>
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| − | \definemathalignment
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| − | [gather]
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| − | [n=1,align={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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| − | </texcode>
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| − | | |
| − | <context>
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| − | \definemathalignment
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| − | [gather]
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| − | [n=1,align={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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| − |
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| − | == Cases ==
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| − | Context provides a {{cmd|startmathcases}} {{cmd|stopmathcases}} pair to make it easy get cases.
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| − | <texcode>
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| − | \startformula
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| − | f(x) = \startmathcases
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| − | \NC x, \NC if $0 \le x \le \frac12$ \NR
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| − | \NC 1-x ,\NC if $\frac12 \le x \le 1$ \NR
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| − | \stopmathcases
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| − | \stopformula
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| − | </texcode>
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| − | gives
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| − | <context>
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| − | \startformula
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| − | f(x) = \startmathcases
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| − | \NC x, \NC if $0 \le x \le \frac12$ \NR
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| − | \NC 1-x ,\NC if $\frac12 \le x \le 1$ \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 text mode. An alternative way of getting the same result is to define the second column as a mathcolumn with {{cmd|MC}} like so:
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| − | <texcode>
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| − | \startformula
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| − | f(x) = \startmathcases
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| − | \NC x, \MC \text{if } 0 \le x \le \frac12 \NR
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| − | \NC 1-x ,\MC \text{if } \frac12 \le x \le 1 \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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| − | == Numbered Cases ==
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| − | [[Category:Math]]
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