# eqscplot

From MASS v7.3-0
by Brian Ripley

##### Plots with Geometrically Equal Scales

Version of a scatterplot with scales chosen to be equal on both axes, that is 1cm represents the same units on each

- Keywords
- hplot

##### Usage

`eqscplot(x, y, ratio = 1, tol = 0.04, uin, ...)`

##### Arguments

- x
- vector of x values, or a 2-column matrix, or a list with components
`x`

and`y`

- y
- vector of y values
- ratio
- desired ratio of units on the axes. Units on the y axis are drawn at
`ratio`

times the size of units on the x axis. Ignored if`uin`

is specified and of length 2. - tol
- proportion of white space at the margins of plot
- uin
- desired values for the units-per-inch parameter. If of length 1, the desired units per inch on the x axis.
- ...
- further arguments for
`plot`

and graphical parameters. Note that`par(xaxs="i", yaxs="i")`

is enforced, and`xlim`

and`ylim`

will be adjusted accordingly.

##### Details

Limits for the x and y axes are chosen so that they include the
data. One of the sets of limits is then stretched from the midpoint to
make the units in the ratio given by `ratio`

. Finally both are
stretched by `1 + tol`

to move points away from the axes, and the
points plotted.

##### Value

- invisibly, the values of
`uin`

used for the plot.

##### Note

Arguments `ratio`

and `uin`

were suggested by Bill Dunlap.

##### Side Effects

performs the plot.

##### References

Venables, W. N. and Ripley, B. D. (2002)
*Modern Applied Statistics with S.* Fourth edition. Springer.

##### See Also

*Documentation reproduced from package MASS, version 7.3-0, License: GPL-2 | GPL-3*

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