R: Plots with Geometrically Equal Scales

eqscplot {MASS} | R Documentation

## Plots with Geometrically Equal Scales

### Description

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

### 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.

### Side Effects

performs the plot.

### Note

Arguments `ratio` and `uin` were suggested by Bill Dunlap.

### References

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

### See Also

`plot`, `par`

[Package MASS version 7.3-52 Index]