convert real numbers to img form

Question

armin m 2021-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/1596579-convert-real-numbers-to-img-form

编辑： John D'Errico 2021-11-26

hi.i have real number which i want to convert t img form. how can i do this?

e.g: 8 to 8i

tnx

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Answer 1

Chunru 2021-11-26

1
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https://ww2.mathworks.cn/matlabcentral/answers/1596579-convert-real-numbers-to-img-form#answer_841004

a = 8
a = 8
b = a*1i                % method 1
b = 0.0000 + 8.0000i
c = complex(0, a)       % method 2
c = 0.0000 + 8.0000i

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John D'Errico 2021-11-26

编辑：John D'Errico 2021-11-26

+1 of course, as this seems to cover the bases completely.

I would only add that MATLAB does not have a purely imaginary form, only a complex form. Since the OP seems to be hoping to see a number of the form 8i, they may become confused when seeing a zero real part displayed. If the real part is zero, then the result is purely imaginary.

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