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  • $\begingroup$ Alchemy as well as wizardry... $\endgroup$ Commented Jan 26, 2013 at 18:46
  • $\begingroup$ @Mr.Wizard: thanks..that exactly what I wanted to know ! $\endgroup$ Commented Jan 27, 2013 at 5:31
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    $\begingroup$ @rafiki I'm glad I could help. It was not included in your answer but you would do well to learn about patterns and pattern matching. In this case it may be wise to match a more specific matrix before it is passed to the inner Function to make sure that the data given to Arrow is not invalid: arrows[matrix : {{_, _} ..}?(MatrixQ[#, NumericQ] &)] := -- this is a complicated pattern, somewhat intentionally: your effort to understand it may teach you several different aspects of Mathematica patterns and programming. Ask if you need help. mathematica.stackexchange.com/a/3146/121 $\endgroup$ Commented Jan 27, 2013 at 5:46
  • $\begingroup$ @Mr.Wizard:thanks for suggestion on optimization...I will code more on it..thanks again :) $\endgroup$ Commented Jan 27, 2013 at 6:01