Difference between revisions of "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. | Be sure to also read [http://dl.contextgarden.net/myway/mathalign.pdf Using \startalign and friends] written by Aditya Mahajan. | ||
| − | + | = Basic Alignment with {{cmd|startalign}} = | |
<context source=yes> | <context source=yes> | ||
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{{cmd|NC}} stands for new column, {{cmd|NR}} stands for new row. | {{cmd|NC}} stands for new column, {{cmd|NR}} stands for new row. | ||
| − | + | = Changing the number of columns = | |
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> | 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> | </context> | ||
| − | + | = Specify the alignment mode 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 | 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> | </context> | ||
| − | + | = Equation numbering {{cmd|startplaceformula}} = | |
Aligned equations can be numbered by using {{cmd|startplaceformula}} (as usual), and by placing a tag after {{cmd|NR}} | Aligned equations can be numbered by using {{cmd|startplaceformula}} (as usual), and by placing a tag after {{cmd|NR}} | ||
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</context> | </context> | ||
| − | + | == Sub-numbering {{cmd|startsubformulas}} == | |
The numbering can be changed to a subformula style by encapsulating {{cmd|startplaceformula}} with {{cmd|startsubformulas}} : | The numbering can be changed to a subformula style by encapsulating {{cmd|startplaceformula}} with {{cmd|startsubformulas}} : | ||
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</context> | </context> | ||
| − | + | = Defining new alignment structures = | |
New alignment can be defined using {{cmd|definemathalignment}}. For example, to emulate <code>gather</code> environment of amsmath, we can use | 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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</context> | </context> | ||
| − | + | = Cases = | |
Context provides a {{cmd|startmathcases}} {{cmd|stopmathcases}} pair to make it easy to get cases. | Context provides a {{cmd|startmathcases}} {{cmd|stopmathcases}} pair to make it easy to get cases. | ||
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Each line must end with a {{cmd|NR}}. | Each line must end with a {{cmd|NR}}. | ||
| − | + | = Numbered Cases = | |
[[Category:Math]] | [[Category:Math]] | ||
Revision as of 09:03, 12 May 2024
< Main Page | Math | Math with newmat | MathML >
Be sure to also read Using \startalign and friends written by Aditya Mahajan.
Contents
Basic Alignment with \startalign
\startformula\startalign \NC v \NC = u + at \NR \NC h \NC = ut + \frac12 gt^2 \NR \stopalign\stopformula
\NC stands for new column, \NR stands for new row.
Changing the number of columns
The above equations were aligned at =. Suppose you also want the + to align. Well, this is simple in context, simply specify the number of columns with \startalign
\startformula \startalign[n=3] \NC v \NC = u \NC + at \NR \NC h \NC = ut \NC + \frac12 gt^2 \NR \stopalign \stopformula
Specify the alignment mode 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
\startformula \startalign[n=3,align={1:right,2:middle,3:left}] \NC v \NC = u \NC+ at \NR \NC h \NC= ut \NC+ \frac12 gt^2 \NR \stopalign \stopformula
This mechanism allows fancier alignments like
\startformula \startalign[n=4,align={1:right,2:right,3:middle,4:left}] \NC \text{We have} \quad \NC v \NC = u \NC+ at \NR \NC \text{and} \quad \NC h \NC= ut \NC+ \frac12 gt^2 \NR \stopalign \stopformula
Equation numbering \startplaceformula
Aligned equations can be numbered by using \startplaceformula (as usual), and by placing a tag after \NR
\setuplayout[scale=0.8,width=13cm] \startplaceformula \startformula \startalign \NC v \NC = u + at \NR[eq:v] \NC h \NC = ut + \frac12 gt^2 \NR[eq:h] \stopalign \stopformula \stopplaceformula Equation~(\in[eq:v]) tells the final velocity after time~$t$ and equation~(\in[eq:h]) tells the distance travelled in time~$t$.
Sub-numbering \startsubformulas
The numbering can be changed to a subformula style by encapsulating \startplaceformula with \startsubformulas :
\setuplayout[scale=0.8,width=13cm] \startsubformulas[eq:total] \startplaceformula \startformula \startalign \NC v \NC = u + at \NR[eq:v] \NC h \NC = ut + \frac12 gt^2 \NR[eq:h] \stopalign \stopformula \stopplaceformula \stopsubformulas Equation~(\in[eq:v]) tells the final velocity after time~$t$ and equation (\in[eq:h]) tells the distance travelled in time~$t$.
instead of \placeformula and numbering the subformulas using \NR[+][a], \NR[+][b], … instead:
The numbering can be changed to a subformula style using \placesubformula instead of \placeformula and numbering the subformulas using \NR[+][a], \NR[+][b], … instead:
\setuplayout[scale=0.8,width=13cm] \startplaceformula \startformula \startalign \NC v \NC = u + at \NR[+][eq:v] \NC h \NC = ut + \frac12 gt^2 \NR[+][eq:h] \stopalign \stopformula \stopplaceformula Equation~(\in[eq:v]) tells the final velocity after time~$t$ and equation (\in[eq:h]) tells the distance travelled in time~$t$.
Defining new alignment structures
New alignment can be defined using \definemathalignment. For example, to emulate gather environment of amsmath, we can use
\definemathalignment [gather] [n=1,align={1:middle}] \startformula \startgather \NC ax^2 + bx + c = 0 \NR \NC \text{roots} = \frac{ -b \pm \sqrt{b^2 - 4ac}}{2a} \NR \stopgather \stopformula
Cases
Context provides a \startmathcases \stopmathcases pair to make it easy to get cases.
\startformula \delta_{ij} = \startmathcases \NC 1 \NC \text{if } i = j \NR \NC 0 \NC \text{otherwise} \NR \stopmathcases \stopformula
gives
The cases environment consists of two columns, separated by \NC. The second column is by default in math mode. To typeset the second column in text mode, use \TC
\startformula \delta_{ij} = \startmathcases \NC 1 \TC if \m{i = j} \NR \NC 0 \TC otherwise \NR \stopmathcases \stopformula
Each line must end with a \NR.
