clc
clear
disp('ck')
x=-9
y=sqrt(x)
real_y=real(y)
imag_y=imag(y)
x1=[5 7 15]
y1=sqrt(x1)
z1=x1.*y1
x2=-3+4i
y2=6-8i
mag_x2=abs(x2)
mag_y2=abs(y2)
ang_x2=angle(x2)
ang_y2=angle(y2)