---
title: "linearInterpolate(values:atIndices:)"
framework: accelerate
role: symbol
role_heading: Type Method
path: "accelerate/vdsp/linearinterpolate(values:atindices:)-9rxb4"
---

# linearInterpolate(values:atIndices:)

Returns the double-precision linearly interpolated values of a vector at the specified indices.

## Declaration

```swift
static func linearInterpolate<T, U>(values: T, atIndices indices: U) -> [Double] where T : AccelerateBuffer, U : AccelerateBuffer, T.Element == Double, U.Element == Double
```

## Parameters

- `values`: The values to interpolate.
- `indices`: The indices to the output vector.

## Mentioned in

Using linear interpolation to construct new data points

## Return Value

Return Value A vector that contains the linearly interpolated values.

## Discussion

Discussion The following code creates a five-element vector from two values using linear interpolation. The last index in indices determines the length of the operation result. let values: [Double] = [0, 100] let indices: [Double] = [0, 4]

let result = vDSP.linearInterpolate(values: values,                                     atIndices: indices)

// Prints "[0.0, 25.0, 50.0, 75.0, 100.0]". print(result)

## See Also

### Type Methods

- [absolute(_:)](accelerate/vdsp/absolute(_:)-9c3ge.md)
- [absolute(_:)](accelerate/vdsp/absolute(_:)-5ehc1.md)
- [absolute(_:result:)](accelerate/vdsp/absolute(_:result:)-9x5jn.md)
- [absolute(_:result:)](accelerate/vdsp/absolute(_:result:)-1wu9x.md)
- [absolute(_:result:)](accelerate/vdsp/absolute(_:result:)-657bd.md)
- [absolute(_:result:)](accelerate/vdsp/absolute(_:result:)-4pigo.md)
- [add(_:_:)](accelerate/vdsp/add(_:_:)-9mv1a.md)
- [add(_:_:)](accelerate/vdsp/add(_:_:)-2ftxc.md)
- [add(_:_:)](accelerate/vdsp/add(_:_:)-53nh9.md)
- [add(_:_:)](accelerate/vdsp/add(_:_:)-7swvf.md)
- [add(_:_:result:)](accelerate/vdsp/add(_:_:result:)-2531u.md)
- [add(_:_:result:)](accelerate/vdsp/add(_:_:result:)-2w0o9.md)
- [add(_:_:result:)](accelerate/vdsp/add(_:_:result:)-338hl.md)
- [add(_:_:result:)](accelerate/vdsp/add(_:_:result:)-3vzwi.md)
- [add(_:to:count:result:)](accelerate/vdsp/add(_:to:count:result:)-g1dk.md)