Projection Index

Description

Finds the projection index for a matrix of points x, when projected onto a curve s. The curve need not be of the same length as the number of points. If the points on the curve are not in order, this order needs to be given as well, in tag.

Usage

1
get.lam(x, s, tag, stretch = 2)

Arguments

x

a matrix of data points

s

a parametrized curve, represented by a polygon.

tag

the order of the point in s. Default is the given order.

stretch

A stretch factor for the endpoints of the curve; a maximum of 2. it allows the curve to grow, if required, and helps avoid bunching at the end.

Value

A structure is returned which represents a fitted curve. It has components

s

The fitted points on the curve corresponding to each point x.

tag

the order of the fitted points

lambda

The projection index for each point

dist

The total squared distance from the curve

See Also

principal.curve

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