Find the biggest eigenvalue in R

Question

I am a newby in R and I have a square matrix 100x100. I want to find the biggest eigenvalue of this matrix. I tried

is.indefinite(x)

but it writes

is.indefinite(x) : argument x is not a symmetric matrix

Does anyone know a function to find eigenvalues, or better the biggest eigenvalue in R?

Answer 1

To choose the largest eigenvalue that's not complex, you can do:

eigenvalues = eigen(x)$values

max(Re(eigenvalues[abs(Im(eigenvalues)) < 1e-6])) # you have to choose the precision you like here