mosaic_formula | R Documentation |

These functions convert formulas into standard shapes, including by incorporating a groups argument.

```
mosaic_formula(
formula,
groups = NULL,
envir = parent.frame(),
max.slots = 3,
groups.first = FALSE
)
mosaic_formula_q(
formula,
groups = NULL,
max.slots = 3,
groups.first = FALSE,
...
)
```

`formula` |
a formula |

`groups` |
a name used for grouping |

`envir` |
the environment in which the resulting formula may be evaluated.
May also be |

`max.slots` |
an integer specifying the maximum number of slots for the resulting formula. An error results from trying to create a formula that is too complex. |

`groups.first` |
a logical indicating whether groups should be inserted ahead of the condition (else after). |

`...` |
additional arguments (currently ignored) |

`mosaic_formula_q`

uses nonstandard evaluation of `groups`

that may be
necessary for use within other functions. `mosaic_formula`

is a wrapper
around `mosaic_formula_q`

and quotes `groups`

before passing it along.

```
mosaic_formula( ~ x | z )
mosaic_formula( ~ x, groups=g )
mosaic_formula( y ~ x, groups=g )
# this is probably not what you want for interactive use.
mosaic_formula_q( y ~ x, groups=g )
# but it is for programming
foo <- function(x, groups=NULL) {
mosaic_formula_q(x, groups=groups, envir=parent.frame())
}
foo( y ~ x , groups = g)
```

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