IMAG Imaginary Function

Section: Elementary Functions

Usage

Returns the imaginary part of the input array for all elements. The general syntax for its use is 
   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.

Example

The following demonstrates 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