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Justin Hynes's profile - activity

2014-11-03 11:26:53 +0200 commented question Evaluation question

I've had other examples. I'm new at this, so please tell me if there are specs (version, my computer or the like) where I can look for clues to fix this bug

2014-10-31 22:28:29 +0200 answered a question Evaluation question

I'm in 6.3. It doesn't automatically offer to update?

2014-10-31 20:56:55 +0200 received badge  Editor (source)
2014-10-31 20:56:22 +0200 asked a question Evaluation question

Please explain to me the difference between the two computations:

lin=2*x - y + 2.0;lin(x=-11/9,y=-4/9)
-2.22044604925031e-16

and

2*(-11/9)-(-4/9)+2.000000000000000000
0.000000000000000000

It has to be a floating point computation, and I'm interested only in the sign of the outcome, which is why the first example gives me trouble.