sumLogDiag: Sum the Logarithm of (Diagonal) Elements
In SpatioTemporal: Spatio-Temporal Model Estimation

Description Usage Arguments Value Author(s) See Also Examples

Computes the sum of the logarithm of the diagonal elements in a matrix, or of elements in a vector. This corresponds to the logarithm of the determinant for a Cholesky factor. Behaviour is undefined for any elements that are <=0.

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sumLogDiag(mat)

sumLog(v)

`mat`	A square matrix (preferably a Cholesky factor).
`v`	A vector

Sum of the logarithm of the (diagonal) elements.

Johan Lindstrom

Other basic linear algebra: blockMult, crossDist, makeCholBlock, norm2

## Create a covariance matrix
S <- cbind(c(2,1),c(1,2))
## compute Cholesky factor
R <- chol(S)
## compute determinant
log(det(R))
## compare with sum of the logarithm of diagonal elements
sumLogDiag(R)
##or using sumLog (usefull e.g. for the Matrix-class)
sumLog(diag(R))