pattern matching in f# with help of 2D array

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Hi friends,
i want to match semicircle pattern of '1' using 8x8 array.
now problem is that when i execute this code for left and right semicircle i get stackoverflow exception.

Here is example for left semicircle that i want to match :

0 1 0 0 0 0 0 0
1 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0
0 1 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0

Below code is for left semicircle:

let MatchLeft aryLeft =
    match aryLeft with
    | [|[|_;1;_;_;_;_;_;_|];[|1;_;_;_;_;_;_;_|];[|1;_;_;_;_;_;_;_|];[|_;1;_;_;_;_;_;_|]|] 
    | [|[|_;_;1;_;_;_;_;_|];[|_;1;_;_;_;_;_;_|];[|_;1;_;_;_;_;_;_|];[|_;_;1;_;_;_;_;_|]|] 
    | [|[|_;_;_;1;_;_;_;_|];[|_;_;1;_;_;_;_;_|];[|_;_;1;_;_;_;_;_|];[|_;_;_;1;_;_;_;_|]|] 
    | [|[|_;_;_;_;1;_;_;_|];[|_;_;_;1;_;_;_;_|];[|_;_;_;1;_;_;_;_|];[|_;_;_;_;1;_;_;_|]|] 
    | [|[|_;_;_;_;_;1;_;_|];[|_;_;_;_;1;_;_;_|];[|_;_;_;_;1;_;_;_|];[|_;_;_;_;_;1;_;_|]|]
    | [|[|_;_;_;_;_;_;1;_|];[|_;_;_;_;_;1;_;_|];[|_;_;_;_;_;1;_;_|];[|_;_;_;_;_;_;1;_|]|] 
    | [|[|_;_;_;_;_;_;_;1|];[|_;_;_;_;_;_;1;_|];[|_;_;_;_;_;_;1;_|];[|_;_;_;_;_;_;_;1|]|] -> true
    | _ -> false

kindly help me out...
if there are other simple ways to math this then plz let me know asap....

Posted 26-May-11 3:29am

ganesh mahajan

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-05-26T07:06:00

Stack overflow is usually pretty easy to detect.

Nearly 100% of such cases is when you use recursion or mutual recursion (of more than one methods calling each other in cycle). In such cases, your bug is not providing a condition when this recursion ever finishes.

See http://en.wikipedia.org/wiki/Recursion[^].

It needs your code of course, but you can do it yourself.

In my solution to this question I explain how this condition occurs and how to solve this problem:
System.StackOverflowException' occurred in sample.DLL[^].

—SA