10e5 == 10^5 is not true in MATLAB

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prohi
prohi 2017-11-4
编辑： Vasileios Delimaras 2024-2-17
If you type in
10e5 == 10^5
ans =
logical
0
so 10e5 does NOT mean 10 to the power of 5 but it means 10 to the power of 6.
10e5 == 10^6
ans =
logical
1
What does 10e5 mean then? Is it somewhere in the documentation? I just can't seem to find it, I've been looking for it for quite some time now.
Thanks for the help!
  1 个评论
Vasileios Delimaras
Vasileios Delimaras 2024-2-17
编辑：Vasileios Delimaras 2024-2-17
The notation "10e5" means "10 times of 10 to the power of 5," where the "e" represents the exponent of the power of 10 (10^x). So for your example, 1e5 == 10^5.

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Birdman
Birdman 2017-11-4
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Guillaume
Guillaume 2017-11-4
编辑：Jan 2017-11-5
Or in short,
aeb
means
a * 10^b
so 10e5 is 10 * 10^5, indeed the same as 10^6. And similarly, 9e5 does not mean 9^5 == 59409 but 9*10^5 = 900000

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chaman lal dewangan
chaman lal dewangan 2019-12-21
1e6=10^6;
  1 个评论
John D'Errico
John D'Errico 2023-7-9
Ran in:
@chaman lal dewangan - If you think this statement is relevant, then you don't understand floating point numbers. That it happens to work in this instance, but not for the case of 1e5, this is just mathematical happenstance. SOMETIMES, you get lucky in any such test.
1e6==10^6
ans = logical
1
But to properly use MATLAB, you don't want to leave things to mathematical happenstance, hoping to get lucky. That is just a bad idea.

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