Fortran arrays are indexed as you choose. Vectors would be arrays. Array operations will lose if the compiler doesn't scalarization/deforestation properly (if

Fortran arrays are indexed as you choose. Vectors would be arrays. Array operations will lose if the compiler doesn't scalarization/deforestation properly (if deforestation is an appropriate word when dealing with arrays rather than lists/trees). Subroutines libraries and GPUs are irrelevant.