How is it possible that the same matrix x in test 2 and test3 give different results? I guess you copy in the test 3 the wrong matrix?
Impossible to understand the tests
Too much variation on how many digits of precision you want
Now should be ok. Sorry but it is my first problem published.
For any question write me.
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Project Euler: Problem 8, Find largest product in a large string of numbers
Multiply a column by a row
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multiply by three
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subtract central cross
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