Description Usage Arguments Details Value Author(s) Examples

Mutate input variables using a formula.

1 2 |

`from` |
a data.frame object with variables |

`formula` |
a formula indicating the operation to create new varibles. Look at the detail section for explanantion. |

`as` |
a character vector with names of new variables. |

`na.remove` |
a logical value indicating whether NA values should be removed. |

`logic_convert` |
logical value indicating if the new logical varaible are converted to |

`...` |
further arguments |

The formula is composed of two part:

`column_names ~ trasformed_variables`

the left-hand side are the names of the column to transform, and the right-hand the operations applied to the selected columns, using the `I()`

function.

For example:

`column_names1 + column_names2 ~ I(log(column_names1)) + I(column_names2/100)`

the `column_names1`

is mutated in `log(column_names1)`

and `column_names2`

is divided by 100.

If `na.remove`

is set to `TRUE`

, variables are mutaded, and then the observation with missing are removed.

Returns the original data.frame object with mutaded varaibles.

Alessio Serafini

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | ```
data("airquality")
dt <- airquality
head(transform(from = dt, Ozone ~ I(Ozone-Ozone)))
head(transform(from = dt, Ozone ~ log(Ozone)))
head(transform(from = dt, Ozone ~ I(Ozone>5)))
head(transform(from = dt, Ozone ~ I(Ozone>5), logic_convert = TRUE))
head(transform(from = dt, ~ log()))
head(transform(from = dt, . ~ log()))
head(transform(from = dt, NULL ~ log()))
head(transform(from = dt, Ozone + Day ~ log()))
head(transform(from = dt, Ozone + Day ~ log(Ozone/100) + exp(Day)))
head(transform(from = dt, Ozone ~ log()))
head(transform(from = dt,Ozone + Wind ~ C(log(1))))
head(transform(from = dt,Ozone + Wind ~ log(Ozone) + C(10)))
head(transform(from = dt, Ozone + Wind~ C(log(Ozone))))
foo <- function(x, a = 100){return(x-x + a)}
head(transform(from = dt, Ozone + Wind ~ foo(a = 100)))
head(transform(from = dt, . ~ foo(a = 100)))
head(transform(from = dt, Ozone + Wind ~ log(log(1))))
``` |

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