Why do I get zero?
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Running 7.10.0 (R2010a) under Windows 7 on an Intel i5 (Lenovo laptop):
K>> TAhi
TAhi = -8.6578e+009
K>> TAlo
TAlo = -8.6578e+009
K>> TAhi/2.0 - TAlo/2.0
ans = 9.5367e-007
K>> (TAhi+TAlo)/2.0 - TAlo
ans = 0
Why do I get 0 when I should get 9.5367e-007 ? I wouldn't image e-007 is anywhere near machine tolerance.
Any help is appreciated!
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Akzeptierte Antwort
Nirmal Gunaseelan
am 24 Jun. 2011
The next highest floating point number representable relative to the current number is probably the issue here. Please read further at EPS documentation page.
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Weitere Antworten (2)
Fangjun Jiang
am 24 Jun. 2011
Maybe you can type in the following command and then do your calculation again to see the difference
format long
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David Young
am 24 Jun. 2011
(TAhi-TAlo)/TAhi is close to machine precision, and it's this relative size that matters when comparing two almost equal numbers.
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