mgp.axis {Hmisc} | R Documentation

## Draw Axes With Side-Specific mgp Parameters

### Description

`mgp.axis` is a version of `axis` that uses the appropriate side-specific `mgp` parameter (see `par`) to account for different space requirements for axis labels vertical vs. horizontal tick marks. `mgp.axis` also fixes a bug in `axis(2,...)` that causes it to assume `las=1`.

`mgp.axis.labels` is used so that different spacing between tick marks and axis tick mark labels may be specified for x- and y-axes. Use `mgp.axis.labels('default')` to set defaults. Users can set values manually using `mgp.axis.labels(x,y)` where `x` and `y` are 2nd value of `par('mgp')` to use. Use `mgp.axis.labels(type=w)` to retrieve values, where `w='x'`, `'y'`, `'x and y'`, `'xy'`, to get 3 `mgp` values (first 3 types) or 2 `mgp.axis.labels`.

### Usage

    mgp.axis(side, at = NULL, ...,
             mgp = mgp.axis.labels(type = if (side == 1 | side == 3) "x"
                                   else "y"),
             axistitle = NULL)

    mgp.axis.labels(value,type=c('xy','x','y','x and y'))

### Arguments

`side` |
`at` | see `par`
`...` | arguments passed through to `axis`
`mgp` | see `par`
`axistitle` | if specified will cause `axistitle` to be drawn on the appropriate axis as a title
`value` | vector of values to which to set system option `mgp.axis.labels`
`type` | see above

### Value

`mgp.axis.labels` returns the value of `mgp` (only the second element of `mgp` if `type="xy"` or a list with elements `x` and `y` if `type="x or y"`, each list element being a 3-vector) for the appropriate axis if `value` is not specified, otherwise it returns nothing but the system option `mgp.axis.labels` is set.
`mgp.axis` returns nothing.

### Side Effects

`mgp.axis.labels` stores the value in the system option `mgp.axis.labels`

### Author(s)

Frank Harrell

### See Also

`par`

### Examples

    ## Not run:
    mgp.axis.labels(type='x')  # get default value for x-axis
    mgp.axis.labels(type='y')  # get value for y-axis
    mgp.axis.labels(type='xy') # get 2nd element of both mgps
    mgp.axis.labels(type='x and y')  # get a list with 2 elements
    mgp.axis.labels(c(3,.5,0), type='x')  # set
    options('mgp.axis.labels')            # retrieve

    plot(..., axes=FALSE)
    mgp.axis(1, "X Label")
    mgp.axis(2, "Y Label")

    ## End(Not run)

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