fftimag

Imaginary component of a Fast Fourier Transform (FFT) function.

Syntax

fftimag(vec_expr_1, [,vec_expr_2])

Argument

vec_expr_1: The real component of a vector.
vec_expr_2: An optional parameter that specifies the imaginary component of a vector.

Example

Curve Math Vectors	Result
`x = freq(c1.x)` `y = fftimag(c1.y)`	Given c1, a curve is created which is the imaginary component of the FFT of c1.

Comments

The fftimag function returns the imaginary component of a Fast Fourier Transform (FFT). vec_expr_1 and vec_expr_2 are assumed to be evenly sampled. The resultant vector has a number of elements equal to the least power of two greater than or equal to the number of elements in vec_expr_1.

If only one vector expression is passed to fftimag, the function returns a regular FFT.

If two vectors are passed to fftimag, a complex FFT is calculated. vec_expr_1 and vec_expr_2 must have the same number of elements.

The FFT is complex-valued and used to map time-domain data into the frequency domain.