在haskell中使用repa,是否有一种打印矩阵的方法,因此它们的格式很好,矩阵行位于不同的行上(大多数数值计算环境的默认设置,如R或matlab)?
我可以写一个,但它似乎已经存在。
这种类型的输出难以与之交互:
λ> foo
AUnboxed ((Z :. 3) :. 5) (fromList [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15])
答案 0 :(得分:2)
这对我有用。也许值得添加到维修或修理额外包裹?
{-# LANGUAGE FlexibleInstances #-}
module PrettyPrint where
import Data.Array.Repa
import Data.Array.Repa.Algorithms.Matrix
import Text.PrettyPrint
import Text.PrettyPrint.HughesPJClass
instance (Source t a, Pretty a) => Pretty (Array t DIM1 a) where
pPrint a = brackets $ hcat $ punctuate (comma <> space) elems
where
elems = [ pPrint (a!j) | i <- [0..n-1], let j = Z :. i ]
Z :. n = extent a
instance (Source t a, Pretty a) => Pretty (Array t DIM2 a) where
pPrint a = vcat elems
where
elems = [ pPrint (slice a j) | i <- [0..n-1], let j = Any :. i :. All]
Z :. n :. _m = extent a