<!--
{
  "availability" : [
    "iOS: 16.4.0 -",
    "iPadOS: 16.4.0 -",
    "macCatalyst: 16.4.0 -",
    "macOS: 13.3.0 -",
    "tvOS: 16.4.0 -",
    "visionOS: 1.0.0 -",
    "watchOS: 9.4.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Accelerate",
  "identifier" : "/documentation/Accelerate/cblas_dzasum(_:_:_:)",
  "metadataVersion" : "0.1.0",
  "role" : "Function",
  "symbol" : {
    "kind" : "Function",
    "modules" : [
      "Accelerate"
    ],
    "preciseIdentifier" : "c:@F@cblas_dzasum"
  },
  "title" : "cblas_dzasum(_:_:_:)"
}
-->

# cblas_dzasum(_:_:_:)

Computes the sum of the absolute values of real and imaginary parts of elements in a vector (single-precision complex).

```
func cblas_dzasum(_ N: __LAPACK_int, _ X: OpaquePointer?, _ INCX: __LAPACK_int) -> Double
```

## Parameters

`N`

Number of elements in the vector.

`X`

Source vector

`INCX`

Stride within `X`. For example, if `incX` is 7, every 7th element is used.

## Return Value

The return value is a single floating point value that contains the sum of the absolute values of both the real and imaginary parts of the vector.

## Discussion> Important:
> Apple provides the BLAS and LAPACK libraries under the Accelerate framework to be in line with LAPACK 3.9.1. Starting with iOS 26, iPadOS 26, macOS 26, tvOS 26, visionOS 26, and watchOS 26, the libraries are in line with LAPACK 3.12.0. These new interfaces provide additional functionality, as well as a new ILP64 interface. To use the new interfaces, define `ACCELERATE_NEW_LAPACK` before including the Accelerate or vecLib headers. For ILP64 interfaces, also define `ACCELERATE_LAPACK_ILP64`. For Swift projects, specify `ACCELERATE_NEW_LAPACK=1` and `ACCELERATE_LAPACK_ILP64=1` as preprocessor macros in Xcode build settings under Apple Clang - Preprocessing > Preprocessor Macros.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)