matpow.Rd
Compute the k-th power of a matrix. Whereas x^k
computes
element wise powers, x %^% k
corresponds to k−1 matrix multiplications, x %*% x %*% ... %*% x
.
x %^% k
a square matrix
.
an integer, k≥0.
Argument k is coerced to integer using as.integer
.
The algorithm uses O(log2(k)) matrix multiplications.
A matrix of the same dimension as x
.
If you think you need x^k
for k<0, then consider
instead solve(x %^% (-k))
.
%*%
for matrix multiplication.