How to get the value of exponential power?

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Muhammad Yasirroni 2019-4-15

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/456369-how-to-get-the-value-of-exponential-power

编辑： Muhammad Yasirroni 2019-4-15

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)].

_

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

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Stephen23 2019-4-15

编辑：Stephen23 2019-4-15

"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:

https://en.wikipedia.org/wiki/Scientific_notation#E-notation

Muhammad Yasirroni 2019-4-15

编辑：Muhammad Yasirroni 2019-4-15

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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