Section: Elementary Functions
y = imag(x)
where x is an n-dimensional array of numerical type. The output
is the same numerical type as the input, unless the input is complex
or dcomplex. For complex inputs, the imaginary part is a floating
point array, so that the return type is float. For dcomplex
inputs, the imaginary part is a double precision floating point array, so that
the return type is double. The imag function returns zeros for
real and integer types.
imag applied to a complex scalar.
--> imag(3+4*i) ans = 4
The imaginary part of real and integer arguments is a vector of zeros, the same type and size of the argument.
--> imag([2,4,5,6]) ans = 0 0 0 0
For a double-precision complex array,
--> imag([2.0+3.0*i,i]) ans = 3 1