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# Autospectrum computation

Compute the element-wise sum of the squares of the real and imaginary parts of a complex vector.

## Topics

### Vector-to-Vector Spectra Computation

[`vDSP_zaspec`](/documentation/Accelerate/vDSP_zaspec)

Computes the autospectrum of a complex single-precision vector.

[`vDSP_zaspecD`](/documentation/Accelerate/vDSP_zaspecD)

Computes the autospectrum of a complex double-precision vector.


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