read :: String -> [[Double]] can't read this format. It expects
"[[0,30,9],[0.1,30,9],...]"
use this code
let m = map f text :: [[Double]]
f a = map g $ lines a
g a = map read $ words a
15.06.2011 15:13, kaffeepause73 пишет:
Dear all,
I want to read numeric data in vector / matrix format generated by octave.
As I haven't seen any octave specific libraries yet (only matlab), I'm
tyrying the way via ascii - file.
The folloing file log.txt contains three signal traces in the three columns
(time, signal 1, signal 2)
0 30 9
0.1 30 9
0.2 30 9
0.3 30 9
0.4 30 9
0.5 30 9
0.6000000000000001 30 9
0.7000000000000001 30 9
0.8 30 9
0.9 30 9
1 30 9
I got the following bit of code compiled with ghc:
import System.IO
main = do
text<- readFile "./log.txt"
putStrLn text
putStrLn "SecondLot"
let m = read text :: [[Double]]
putStrLn (show m)
putStrLn "Finish"
Reading text works, but not reading text into m. The Output:
0 30 9
0.1 30 9
0.2 30 9
0.3 30 9
0.4 30 9
0.5 30 9
0.6000000000000001 30 9
0.7000000000000001 30 9
0.8 30 9
0.9 30 9
1 30 9
SecondLot
signalImport: Prelude.read: no parse
Any suggestions ? - Thanks in advance.
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