# mirrorfill: Fill missing symmetrical landmarks for all specimens in an... In paleomorph: Geometric Morphometric Tools for Paleobiology

## Description

Given an N x 3 x M matrix, where N is the number of landmarks, 3 is the number of dimensions, and M is the number of specimens, fill in missing landmarks using their mirrored counterpart.

## Usage

 `1` ```mirrorfill(A, l1, l2) ```

## Arguments

 `A` An N x 3 x M matrix where N is the number of landmarks, 3 is the number of dimensions, and M is the number of specimens. `l1` Vector of indices for which landmarks to use to make a specimen midline `l2` Vector or matrix of pairs of symmetrical landmarks

## Details

`l2` should be either

• An even length vector containing pairs of landmarks on either side of the specimen. i.e. l2[1] and l2[2] are paired, l2[3] and l2[4] are paired etc.

• A two column matrix with each row giving a pair of symmetrical landmarks.

`l2` should be an even number length containing pairs of landmarks on either side of the specimen.

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12``` ``` # Create array A <- array(rep(1:36, by = 4), dim = c(12, 3, 4)) # Make it symmetrical A[7:12, 1:2, ] <- A[1:6, 1:2, ] A[7:12, 3, ] <- -A[1:6, 3, ] # Remove some data points missinga <- A missinga[1:2, , 1:3] <- NA mirrorA <- mirrorfill(missinga, l1 = c(3:6, 9:12), l2 = c(1, 7, 2, 8)) ```

paleomorph documentation built on May 2, 2019, 9:34 a.m.