inv {pracma}

Matrix Inverse (Matlab Style)

Description

Invert a numeric or complex matrix.

Usage

inv(a)

Arguments

a

real or complex square matrix

Details

Computes the matrix inverse by calling solve(a) and catching the error if the matrix is nearly singular.

Value

square matrix that is the inverse of a.

Note

inv() is the function name used in Matlab/Octave.

See Also

solve

Examples

A <- hilb(6)
B <- inv(A)
B
# Compute the inverse matrix through Cramer's rule:
n <- nrow(A)
detA <- det(A) 
b <- matrix(NA, nrow = n, ncol = n)
for (i in 1:n) {
    for (j in 1:n) {
        b[i, j] <- (-1)^(i+j) * det(A[-j, -i]) / detA
    }
}
b