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How to get the value of exponential power?

Asked by Muhammad Yasirroni on 15 Apr 2019
Latest activity Edited by Muhammad Yasirroni on 15 Apr 2019
Assume that after some computation, matlab give me an output:
a(1)=3.712e-12
a(2)=9.123e-13
How can i got the value of 12 and 13? Assume that a(1) and a(2) is in array a=[a(1) a(2)].
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Edit: to avoid confussion, let me rearrange my question: "Can I get the 'index' (how many zeros in the right of the dot) of the first significant digit from data?". Is this is the only way?
n=1
a(1)=3.712e-12
while 1e1^-n>a(1)
n=n+1;
end

  2 Comments

"How can i got the value of 12 and 13?"
You didn't: those are the powers of ten, they are not "values".
What you show are numbers written in E-notation, which is the a common way that scientists, engineers, and researchers write small/large numbers:
Thank you. But, I already understand that. So, let me rearrange my question: "Can I get the 'index' (how many zeros in the right of the dot) of the first significant digit from data?"
p.s. I edit my question

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1 Answer

Answer by Stephen Cobeldick on 15 Apr 2019
Edited by Stephen Cobeldick on 15 Apr 2019
 Accepted Answer

Just use log10:
>> floor(log10(a))
ans =
-12 -13
The correct answer is [-12,-13], not [12,13] (because these are the powers of ten), but of course you can lose information if you want with abs.

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