How to eliminate numbers without imaginary part?

Question

Ko Fa 2021-1-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/710523-how-to-eliminate-numbers-without-imaginary-part

评论： Ko Fa 2021-1-6

I am trying to keep just the complex numbers.

a =[
    2.70810968
    2.45396925
    1.13928251
   -4.04946201
    0.8829 - 0.13089*i
    0.1308*i + 0.8829
    0.15285*i - 2.00890
   -0.1528510*i - 2.0089069]

Thanks for any help

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2021-1-6

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/710523-how-to-eliminate-numbers-without-imaginary-part#answer_592453

在 MATLAB Online 中打开

format long g
a =[
    2.70810968
    2.45396925
    1.13928251
   -4.04946201
    0.8829 - 0.13089*i
    0.1308*i + 0.8829
    0.15285*i - 2.00890
   -0.1528510*i - 2.0089069]
a = 8×1
                 2.70810968 +                     0i
                 2.45396925 +                     0i
                 1.13928251 +                     0i
                -4.04946201 +                     0i
                     0.8829 -               0.13089i
                     0.8829 +                0.1308i
                    -2.0089 +               0.15285i
                 -2.0089069 -              0.152851i
●
b = a(imag(a) ~= 0)
b = 4×1
                     0.8829 -               0.13089i
                     0.8829 +                0.1308i
                    -2.0089 +               0.15285i
                 -2.0089069 -              0.152851i
●