[B! debug][haskell] somemoã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

somemo id:somemo

debugã¨haskellã«é–¢ã™ã‚‹somemoã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (5)

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GHCiãƒ‡ãƒãƒƒã‚¬
GHCiã¯å˜ç´”ãªå‘½ä»¤çš„ã‚¹ã‚¿ã‚¤ãƒ«ã®ãƒ‡ãƒãƒƒã‚¬ã‚’æè¼‰ã—ã¦ã„ã¦ã€å®Ÿè¡Œä¸ã®è¨ˆç®—ã‚’åœã‚ã¦å¤‰æ•°ã®å€¤ã‚’ç¢ºã‹ã‚ã‚‹ã“ã¨ãŒã§ãã‚‹ã€‚ã“ã®ãƒ‡ãƒãƒƒã‚¬ã¯GHCiã«çµ±åˆã•ã‚Œã¦ãŠã‚Šã€ãƒ‡ãƒ•ã‚©ãƒ«ãƒˆã§æœ‰åŠ¹ã«ãªã£ã¦ã„ã‚‹ã€‚ãƒ‡ãƒãƒƒã‚°æ©Ÿèƒ½ã‚’ä½¿ã†ã®ã«ãƒ•ãƒ©ã‚°ã¯å¿…è¦ãªã„ã€‚ä¸€ã¤ã€é‡è¦ãªåˆ¶é™ãŒã‚ã£ã¦ã€ãƒ–ãƒ¬ãƒ¼ã‚¯ãƒã‚¤ãƒ³ãƒˆã¨ã‚¹ãƒ†ãƒƒãƒ—å®Ÿè¡Œã¯è§£é‡ˆå®Ÿè¡Œã•ã‚Œã¦ã„ã‚‹ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã§ã—ã‹ä½¿ãˆãªã„ã€‚ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«æ¸ˆã¿ã‚³ãƒ¼ãƒ‰ã¯ãƒ‡ãƒãƒƒã‚¬ã‹ã‚‰ã¯è¦‹ãˆãªã„[5]ã€‚ ã“ã®ãƒ‡ãƒãƒƒã‚¬ã¯ä»¥ä¸‹ã®ã‚‚ã®ã‚’æä¾›ã™ã‚‹ã€‚ ãƒ—ãƒã‚°ãƒ©ãƒ ä¸ã®é–¢æ•°å®šç¾©ã‚„å¼ã«ãƒ–ãƒ¬ãƒ¼ã‚¯ãƒã‚¤ãƒ³ãƒˆã‚’è¨å®šã™ã‚‹èƒ½åŠ›ã€‚ãã®é–¢æ•°ãŒå‘¼ã°ã‚ŒãŸã¨ãã€ã‚ã‚‹ã„ã¯ãã®å¼ãŒè©•ä¾¡ã•ã‚ŒãŸã¨ãã€GHCiã¯å®Ÿè¡Œã‚’ä¸æ–ã—ã¦ãƒ—ãƒãƒ³ãƒ—ãƒˆã«æˆ»ã‚‹ã€‚ãã“ã§ã€å®Ÿè¡Œã‚’ç¶šã‘ã‚‹å‰ã«ã€å±€æ‰€å¤‰æ•°ã®å€¤ã‚’èª¿ã¹ã‚‹ã“ã¨ãŒã§ãã‚‹ã€‚ ã‚¹ãƒ†ãƒƒãƒ—å®Ÿè¡ŒãŒã§ãã‚‹ã€‚è©•ä¾¡å™¨ã¯ã€ç°¡ç´„ã‚’ã ã„ãŸã„ä¸€å›žè¡Œã†ã”ã¨ã«å®Ÿè¡Œã‚’ä¸€æ™‚åœæ¢ã—ã€å±€æ‰€å¤‰æ•°ã‚’èª¿ã¹ã‚‹ã“ã¨ãŒã§ãã‚‹ã‚ˆã†ã«ã™ã‚‹ã€‚ã“ã‚Œã¯ãƒ—ãƒã‚°ãƒ©ãƒ ã®ã‚ã‚‰ã‚†ã‚‹åœ°ç‚¹ã«ãƒ–ãƒ¬ãƒ¼ã‚¯ãƒã‚¤ãƒ³ãƒˆã‚’
somemo 2013/08/09
haskell

GHCi

debug
ãƒªãƒ³ã‚¯
Debug.Traceã‚’ä½¿ã£ã¦printfé¢¨ãƒ‡ãƒãƒƒã‚° - ã‚‚ã®ãã•å‚™å¿˜éŒ²
Haskellå‡¦ç†ç³»ã§ã‚ã‚‹GHCã«ã¯Debug.Traceãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã¨ã„ã†ã®ãŒæä¾›ã•ã‚Œã¦ã„ã¾ã™*1ã€‚ãã®ä¸ã®traceé–¢æ•°ã‚’ä½¿ã†ã¨ã€Cè¨€èªžã®ãŠã‘ã‚‹printfãƒ‡ãƒãƒƒã‚°ã®ã‚ˆã†ãªã“ã¨ãŒã§ãã¾ã™ã€‚ ãŸã ã€Haskellã¯é…å»¶è©•ä¾¡ã‚’è¡Œã†è¨€èªžãªã®ã§ã€traceãŒå‘¼ã³å‡ºã•ã‚Œã‚‹ã‚¿ã‚¤ãƒŸãƒ³ã‚°ã«æ³¨æ„ã™ã‚‹å¿…è¦ãŒã‚ã‚‹ãã†ã§ã™ã€‚ ä»¥ä¸‹ã€å‚è€ƒå…ƒã‚µã‚¤ãƒˆ traceé–¢æ•°ã®ä½¿ã„æ–¹ http://www.sampou.org/cgi-bin/haskell.cgi?Trace traceé–¢æ•°ã‚’ä½¿ã†éš›ã®æ³¨æ„ç‚¹ã«ã¤ã„ã¦ http://haskell.g.hatena.ne.jp/jmk/20070706/1183688102 *1:http://www.haskell.org/ghc/docs/latest/html/libraries/base/Debug-Trace.html :traceã®å®Ÿè£…è‡ªä½“ã¯é›£ã—ããªã„ãã†ãªã®ã§ã€ä»–
somemo 2013/05/25
haskell

debug

trace
ãƒªãƒ³ã‚¯
ç¬¬15å›žã€€Haskellã§ã®ãƒ‡ãƒãƒƒã‚°ã®ã‚³ãƒ„ã‚’ã¤ã‹ã‚€
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somemo 2013/05/25
haskell

debug
ãƒªãƒ³ã‚¯
Debug.Trace
somemo 2013/05/25
haskell

debug

trace
ãƒªãƒ³ã‚¯
Haskell ã§ã®ãƒ‡ãƒãƒƒã‚° - ã‚ã©ã‘ãªã„è©±
ã€Œç´”ç²‹é–¢æ•°åž‹è¨€èªžã¯ãƒ‡ãƒãƒƒã‚°ã—ã«ãã„ã€‚ã ã£ã¦ç´”ç²‹ãªé–¢æ•°ã§ printf ãƒ‡ãƒãƒƒã‚°ã§ããªã„ã‹ã‚‰ã€ã¨ã¤ã¶ã‚„ã„ã¦ã„ã‚‹äººã‚’ã‚ˆãè¦‹ã‹ã‘ã¾ã™ã€‚ã“ã‚Œã¾ã§æ”¾ç½®ã—ã¦ãã¾ã—ãŸãŒã€ãƒªãƒ„ã‚¤ãƒ¼ãƒˆãŒ50ã‚’è¶…ãˆãŸã®ã§ã€Haskellã§ã®ãƒ‡ãƒãƒƒã‚°ã«ã¤ã„ã¦æ›¸ãã¾ã™ã€‚ ä¾‹å¤–å‡¦ç†ã¨åŒã˜ã‚ˆã†ã«ã€Haskell ã§ã®ãƒ‡ãƒãƒƒã‚°ã§ã¯ã€ç´”ç²‹ãªé–¢æ•°ã¨ IO ã‚’åˆ†ã‘ã¦è€ƒãˆã‚‹å¿…è¦ã‚ã‚Šã¾ã™ã€‚ IO ã§ã® printf ãƒ‡ãƒãƒƒã‚° IO ã§ã¯ã€putStrLn ã‚„ print ãŒä½¿ãˆã‚‹ã‹ã‚‰å•é¡Œãªã„ã§ã™ã‚ˆãï¼Ÿ foo :: Int -> IO Bool foo i = do x <- ã‚ã‚Œã—ã¦ i putStrLn $ "x = " ++ show x ã“ã‚Œã—ã¦ putStrLn "ã“ã“ã‚‚é€šéŽ" -- ãã‚Œã‚‚ã™ã‚‹ y <- ãã‚Œã‚‚ã™ã‚‹ print y return y ã¡ãªã¿ã«ã€forkIO èµ·å‹•ã—ãŸè»½é‡ã‚¹ãƒ¬ãƒƒãƒ‰ã‹ã‚‰ putStrLn ã™ã‚‹å ´åˆã€è»½é‡ã‚¹
somemo 2013/01/12
haskell

debug
ãƒªãƒ³ã‚¯
1