Version of a scatterplot with scales chosen to be equal on both axes, that is 1cm represents the same units on each
eqscplot(x, y, ratio = 1, tol = 0.04, uin, …)vector of x values, or a 2-column matrix, or a list with components
x and y
vector of y values
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.
proportion of white space at the margins of plot
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.
invisibly, the values of uin used for the plot.
performs the plot.
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.
Venables, W. N. and Ripley, B. D. (2002) Modern Applied Statistics with S. Fourth edition. Springer.