Hi, probably I am just being dumb, but what is the most efficient way to do a sum of every elements in a Vector of either hmatrix or blas? I know there is sum of absolute values from BLAS. So what about I want a plain "sum"? I can only think of the following two ways. 1. Using Data.List.foldl', so it is
sum' = foldl' (+) 0 . toList
in hmatrix or
sum' = foldl' (+) 0 . elems
in blas. 2. Using <.>, so it is
sum' v = constant 1 (dim v) <.> v
in hmatrix or
sum' v = constant (dim v) 1 <.> v
in blas. Which one is better? I guess it probably depends on the internal implementation of BLAS, but I am actually thinking in some thing similar to
t += *v++;
Any delightful idea to convert my mind from a C shaped one to a Haskell shaped one? Best, Xiao-Yong -- c/* __o/* <\ * (__ */\ <