'responsdiffBeta', which is a list
with the following components:
Beta
The matrix of selection gradients.
d
Arguments
G1
A variance matrix.
G2
A variance matrix.
Beta
Either a vector or a matrix of unit length selection gradients
stacked column wise.
means1
An optional vector of trait means of G1 (for internal mean
standardization).
means2
An optional vector of trait means of G2 (for internal mean
standardization).
Author
Geir H. Bolstad
Details
responsdiffBeta calculates the response difference along selection
gradients between two additive-genetic variance matrices as described in
Hansen and Houle (2008).
References
Hansen, T. F. & Houle, D. (2008) Measuring and comparing
evolvability and constraint in multivariate characters. J. Evol. Biol.
21:1201-1219.