What does i mean as example: 1.2428 - 0.0003i

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Matlaber 2019-3-22

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回答： alan daniel 2019-3-25

What is the meaning of the result i get when i run matlab code:

2428 - 0.0003i
2320 - 0.0003i
2250 - 0.0002i
2376 - 0.0003i
2332 - 0.0004i

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Walter Roberson 2019-3-22

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In this context i is the imaginary unit. Those are all complex numbers, such as complex(1.2428, -0.003)

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Stephen23 2019-3-22

编辑：Stephen23 2019-3-22

"Is that mean imaginary unit means the answer is very small?"

No:

https://en.wikipedia.org/wiki/Imaginary_unit

If your high-school did not teach complex numbers then you missed out on a very important mathematical concept. There are plenty of good tutorials online which introduce complex numbers.

Walter Roberson 2019-3-22

If you were doing something like fsolve() or fzero() then it is possible that the system you are working with has multiple answers, some of which happen to be complex valued. If you are finding the root of an equation in a single variable, then you might need to use fzero() and pass a range of values as the second parameter to confine the search to that range.

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