---
title: vDSP_vdist
framework: accelerate
role: symbol
role_heading: Function
path: accelerate/vdsp_vdist
---

# vDSP_vdist

Calculates the single-precision hypotenuses of right triangles with legs that are the lengths of corresponding elements of two pairs of vectors.

## Declaration

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

## Parameters

- `__A`: A vector that contains the lengths of the first set of legs of the triangles.
- `__IA`: The distance between the elements in the input vector A.
- `__B`: A vector that contains the lengths of the second set of legs of the triangles.
- `__IB`: The distance between the elements in the input vector B.
- `__C`: The output vector.
- `__IC`: The distance between the elements in the output vector C.
- `__N`: The number of elements to process.

## Discussion

Discussion The vDSP_vdist and vDSP_vdistD functions calculate the square roots of the sum of the squares of corresponding elements of vectors A and B, using the following operation: for (n = 0; n < N; ++n)     C[n] = sqrt(A[n]*A[n] + B[n]*B[n]); For example, the following code calculates the hypotenuse of four Pythagorean triples: let a: [Float] = [3, 6, 5, 9] let b: [Float] = [4, 8, 12, 12]

var c: [Float] = [0, 0, 0, 0]

let stride = vDSP_Stride(1)

vDSP_vdist(a, stride,            b, stride,            &c, stride,            vDSP_Length(c.count)) On return, c contains [5.0, 10.0, 13.0, 15.0].

## See Also

### Vector distance computation

- [vDSP_vdistD](accelerate/vdsp_vdistd.md)
- [vDSP_distancesq](accelerate/vdsp_distancesq.md)
- [vDSP_distancesqD](accelerate/vdsp_distancesqd.md)