You entered a 4x1 matrix, and so that's why you got an answer of 1. (The code works on general matricies and does not assume the 2x2 case.) Enter the data as a 2x2 matrix to get the result you expect: 
$ ./fet
989 9400
43400 2400
^D

... tons of output ...

[download]

Cheers,
Tom

Tom Moertel : Blog / Talks / CPAN / LectroTest / PXSL / Coffee / Movie Rating Decoder

In reply to Re^11: Algorithm for cancelling common factors between two lists of multiplicands by tmoertel
in thread Algorithm for cancelling common factors between two lists of multiplicands by BrowserUk

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