---
title: vDSP_vtmerg
framework: accelerate
role: symbol
role_heading: Function
path: accelerate/vdsp_vtmerg
---

# vDSP_vtmerg

Performs a tapered merge between two single-precision vectors.

## Declaration

```occ
extern void vDSP_vtmerg(const float *__A, vDSP_Stride __IA, const float *__B, vDSP_Stride __IB, float *__C, vDSP_Stride __IC, vDSP_Length __N);
```

## Parameters

- `__A`: The first input vector.
- `__IA`: The distance between the elements in the first input vector.``
- `__B`: The second input vector.
- `__IB`: The distance between the elements in the second input vector.
- `__C`: The output vector.
- `__IC`: The distance between the elements in the output vector.
- `__N`: The number of complex elements in the output vector.

## Discussion

Discussion The following code performs a tapered merge between two vectors that represent sine waves at different frequencies:     let count = 1024          let vectorA: [Float] = (0 ..< count).map {         return sin(Float($0) * 0.4)     }          let vectorB: [Float] = (0 ..< count).map {         return sin(Float($0) * 0.025)     }          let stride = 1     let n = vDSP_Length(count)          let tapered = [Float](unsafeUninitializedCapacity: count) {         buffer, initializedCount in                  vDSP_vtmerg(vectorA, stride,                     vectorB, stride,                     buffer.baseAddress!, stride,                     n)                  initializedCount = count     } The following image shows the result of the tapered merge in tapered.

## See Also

### Vector-to-vector merging functions

- [vDSP_vtmergD](accelerate/vdsp_vtmergd.md)