# Command/startmathalignment

# \startmathalignment

## Syntax (autogenerated)

\startmathalignment[...=...,...] ... \stopmathalignment | |

...=...,... | inherits from \setupmathalignment |

instance of startmathalignment, generated by \definemathalignment |

## Syntax

\startmathalignment[...,...=...,...] ... \stopmathalignment | |

n | number |

m | number |

distance | dimension |

align | left middle right |

number | auto |

## Description

Using `\startmathalignment` one can align mathematical equations similar to what is known from LaTeX's `amsmath`

package. It is used inside formulas. The usage is straightforward:

\startformula \startmathalignment[...=...] \NC ... \NC ... \NR \stopmathalignment \stopformula

As in tabular materials `\NC` is used as column separator and `\NR` as row separator. Whether the formula is numbered can be controlled by prefixing `\placeformula` to `\startformula`. This will place a single number vertically centred with respect to the equation. When all the subformulas should be numbered individually, one specifies `number=auto`

.

There is a predefined shorthand for `\startmathalignment` which is `\startalign` to match the `amsmath`

name. However, `\startmathalignment` should be preferred, as `\startalign` already has a different meaning outside math mode.

The implementation is found in math-ali.mkiv.

## Arguments

Method | Meaning |
---|---|

`n` |
number of columns |

`m` |
number of column pairs |

`distance` |
distance between column pairs |

`align` |
alignment of columns |

`number` |
numbering mode for lines |

## Example

To imitate certain LaTeX contructs (some might not yet work on the Wiki). More examples can be found in A. Mahajan, *Display Math in ConTeXt*, MAPS **34**, 22–34 (2006).

`align`

\placeformula \startformula \startmathalignment[number=auto] \NC v \NC= u + at, \NR \NC d \NC= ut + \frac{1}{2} at^2. \NR \stopmathalignment \stopformula

`gather`

\placeformula \startformula \startmathalignment[n=1,number=auto] \NC v = u + at, \NR \NC d = ut + \frac{1}{2} at^2. \NR \stopmathalignment \stopformula

`alignat`

\placeformula \startformula \startmathalignment [n=7,align={right,left,right,left,right,left,right}] \NC x_1 \NC + \NC x_2 \NC + \NC 6x_3 \NC = \NC 170, \NR \NC 3x_1 \NC - \NC 110x_2 \NC - \NC x_3 \NC = \NC 4, \NR \NC 14x_1 \NC + \NC 13x_2 \NC + \NC 10x_3 \NC = \NC 25. \NR \stopmathalignment \stopformula

## See also

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