Convert between graphics coordinate systems.

1 2 | ```
grconvertX(x, from = "user", to = "user")
grconvertY(y, from = "user", to = "user")
``` |

`x, y` |
numeric vector of coordinates. |

`from, to` |
character strings giving the coordinate systems to convert between. |

The coordinate systems are

`"user"`

user coordinates.

`"inches"`

inches.

`"device"`

the device coordinate system.

`"ndc"`

normalized device coordinates.

`"nfc"`

normalized figure coordinates.

`"npc"`

normalized plot coordinates.

`"nic"`

normalized inner region coordinates. (The ‘inner region’ is that inside the outer margins.)

(These names can be partially matched.) For the ‘normalized’ coordinate systems the lower left has value 0 and the top right value 1.

Device coordinates are those in which the device works: they are
usually in pixels where that makes sense and in big points (1/72 inch)
otherwise (e.g., `pdf`

and `postscript`

).

A numeric vector of the same length as the input.

1 2 3 4 5 |

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