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 self-starting 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
datato a numeric vector - y
- a numeric vector or an expression that will evaluate in
datato a numeric vector - data
- an optional data frame in which to evaluate expressions
for
xandy, 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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