Problem in assignning the real of complex number

Hello

I want to assign the real of certain complex number,for example

x=2+2*j;

when i write the following command real(x)=0;

matlab output the following error Subscript indices must either be real positive integers or logicals.

but i don't understand the reason, can anyone help me

Thanks

Answer 1

[Azzi Abdelmalek]

x=2+2*j;

real(x) will return the real part of x , if you want to assign 0 to real(x) , just write

x=imag(x)*i

%or

 x=new_x+imag(x)*i

Answer 2

[Andrei Bobrov]

x = complex(0,imag(x))