fftreal
Real component of a Fast Fourier Transform (FFT) function.
Syntax
fftreal(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)
|
Given c1, a curve is created which is the real component of the FFT of c1. |
Comments
The fftreal function returns the real 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 fftreal, the function returns a regular FFT.
If two vectors are passed to fftreal, 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.