This is a constructor function for the class of
sortedXyData
objects. These objects are mostly used in the
initial
function for a self-starting nonlinear regression model, which will be
of the
selfStart class.
USAGE:
sortedXyData(x, y, data)
REQUIRED ARGUMENTS:
x
a numeric vector or an expression that will evaluate in
data to a numeric vector
y
a numeric vector or an expression that will evaluate in
data to a numeric vector
data
an optional data frame in which to evaluate expressions
for
x and
y, if they are given as expressions
VALUE:
A
sortedXyData object. This is a data frame with exactly
two numeric columns, named
x and
y. The rows are
sorted so the
x column is in increasing order. Duplicate
x
values are eliminated by averaging the corresponding
y
values.