Interpolate multiple columns of a data.frame

1 | ```
approxm(data1, n, method = "linear")
``` |

`data1` |
a |

`n` |
the number of points to interpolate |

`method` |
the method to interpolate by, |

Returns a `data.frame`

of all `data1`

variables
interpolated to `n`

rows.

`approx`

is the underlying function and has more
options

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