This file is indexed.

/usr/lib/R/site-library/expm/INDEX is in r-cran-expm 0.999-2-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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balance                 Balance a Square Matrix via LAPACK's DGEBAL
expAtv                  Compute Matrix Exponential exp(A t) * v
                        directly
expm                    Matrix Exponential
expm.Higham08           Matrix Exponential [Higham 2008]
expmCond                Exponential Condition Number of a Matrix
expmFrechet             Frechet Derivative of the Matrix Exponential
logm                    Matrix Logarithm
matStig                 Stig's "infamous" Example Matrix
matpow                  Matrix Power
sqrtm                   Matrix Square Root