Strange (lack of) round-off error using norm
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Hello,
I have found this behaviour:
>> format hex
>> p=[sqrt(2) sqrt(2)]*1e3;
>> sqrt(sum(p.^2))
ans =
409f400000000001
>> norm(p)
ans =
409f400000000000
I understand the round-off error using sqrt. What I do not understand is how does norm do to avoid it.
Thanks,
Mariano
2 个评论
David Goodmanson
2019-2-17
Hi Mariano
I ran this on my PC and got
ans = 409f400000000001
ans = 409f400000000001
Not sure what to say .....
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