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import System(getArgs)
import Numeric.LinearAlgebra
import Control.Parallel.Strategies
import System.Time
inParallel = parMap rwhnf id
parMul x y = fromBlocks [inParallel[x <> y1, x <> y2]]
where p = cols y `div` 2
(y1,y2) = splitColumnsAt p y
main = do
n <- (read . head) `fmap` getArgs
let m = ident n :: Matrix Double
time $ print $ vectorMax $ takeDiag $ parMul m m
time $ print $ vectorMax $ takeDiag $ m <> m
a = (2><3) [1..6::Double]
b = (3><4) [1..12::Double]
splitRowsAt p m = (takeRows p m, dropRows p m)
splitColumnsAt p m = (takeColumns p m, dropColumns p m)
time act = do
t0 <- getClockTime
act
t1 <- getClockTime
print $ tdSec $ normalizeTimeDiff $ diffClockTimes t1 t0
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