如何从列表中删除逗号和括号(hmatrix)

时间:2016-06-24 20:02:19

标签: haskell ghci hmatrix

用于在gnuplot中绘制图形

我试图将这个矩阵打印到一个文件中,但是为了将它执行到gnuplot中我需要创建一个没有逗号和括号的文件,我该怎么做?

*install hmatrix
*install hmatrix-special
*import Numeric.LinearAlgebra

(5><2)
 [   0.12130139101653795, -3.9532277879855915e-2
 , -9.943512129289413e-2, -1.8736674261187188e-2
 ,   0.21650870755682688,  -7.774998273846949e-3
 ,  -0.19540767578866855,  -4.889335919164774e-2
 , -4.296730149180415e-2,    0.11493730960653939 ]

1 个答案:

答案 0 :(得分:1)

这将打印出矩阵,每行都有自己的行:

{-# LANGUAGE NoMonomorphismRestriction #-}

import Numeric.LinearAlgebra

m :: Matrix Double
m = (5><2)
 [   0.12130139101653795, -3.9532277879855915e-2
 , -9.943512129289413e-2, -1.8736674261187188e-2
 ,   0.21650870755682688,  -7.774998273846949e-3
 ,  -0.19540767578866855,  -4.889335919164774e-2
 , -4.296730149180415e-2,    0.11493730960653939 ]

printMatrix m = do
  putStrLn $ unlines $ map (unwords . map show . toList )  (toRows m)

test = printMatrix m