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wrong eigen vectors

i'm using matlab7.can somebody plz tell me why the eigen vectors which is calculated by matlab are not the actual answers(which we calculate mathematically) whereas the eigen values come up correctly.
for eg.
>> a=[3 1 4;0 2 0;0 0 5]

a =

3 1 4
0 2 0
0 0 5

>> [v,d]=eig(a)

v =

1.0000 -0.7071 0.8944
0 0.7071 0
0 0 0.4472

d =

3 0 0
0 2 0
0 0 5
but if we calculate eigen values and eigen vectors of a mathematically,they come out to be
thanks in advance
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