f90 introduced recursion and allocatable (dynamically sized) arrays. So (in reference to tombert's comment), f90 and beyond doesn't have those limitations. It

f90 introduced recursion and allocatable (dynamically sized) arrays. So (in reference to tombert's comment), f90 and beyond doesn't have those limitations. It also introduced conveniences like operator overloading and element-wise array operations, so I think it's a really simple/convenient language for basic scientific computing, if you want to code up some algorithm. That said, I always reach for Julia instead.