sortedXyData
Create a sortedXyData
Object
This is a constructor function for the class of sortedXyData
objects. These objects are mostly used in the initial
function for a selfstarting nonlinear regression model, which will be
of the selfStart
class.
 Keywords
 manip
Usage
sortedXyData(x, y, data)
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
andy
, 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.
See Also
selfStart
, NLSstClosestX
,
NLSstLfAsymptote
, NLSstRtAsymptote
Examples
library(stats)
DNase.2 < DNase[ DNase$Run == "2", ]
sortedXyData( expression(log(conc)), expression(density), DNase.2 )
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