Draw Axes With Side-Specific mgp Parameters

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.

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

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

Arguments

side,at

see par

...

arguments passed through to axis

mgp,cex.axis,cex.lab

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

Side Effects

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

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.

Author

Frank Harrell

See also

par

Examples

if (FALSE) { # \dontrun{
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")

} # }