# What does i mean as example: 1.2428 - 0.0003i

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Matlaber on 22 Mar 2019
Answered: alan daniel on 25 Mar 2019
What is the meaning of the result i get when i run matlab code:
1.2428 - 0.0003i
1.2320 - 0.0003i
1.2250 - 0.0002i
1.2376 - 0.0003i
1.2332 - 0.0004i

Walter Roberson on 22 Mar 2019
In this context i is the imaginary unit. Those are all complex numbers, such as complex(1.2428, -0.003)
Stephen23 on 22 Mar 2019
Edited: Stephen23 on 22 Mar 2019
"Is that mean imaginary unit means the answer is very small?"
No:
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 on 22 Mar 2019
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.

alan daniel on 25 Mar 2019
Thanks