---
title: "linearInterpolate(lookupTable:withOffsets:scale:baseOffset:)"
framework: accelerate
role: symbol
role_heading: Type Method
path: "accelerate/vdsp/linearinterpolate(lookuptable:withoffsets:scale:baseoffset:)-1ye2o"
---

# linearInterpolate(lookupTable:withOffsets:scale:baseOffset:)

Returns the double-precision linearly interpolated values of a lookup table from the specified offsets.

## Declaration

```swift
static func linearInterpolate<T, U>(lookupTable: T, withOffsets offsets: U, scale: Double = 1, baseOffset: Double = 0) -> [Double] where T : AccelerateBuffer, U : AccelerateBuffer, T.Element == Double, U.Element == Double
```

## Parameters

- `lookupTable`: The lookup table.
- `offsets`: The offsets into the lookup table.
- `scale`: The scale factor for the offsets.
- `baseOffset`: The base offset for the offsets.

## Return Value

Return Value The result of the interpolation operation.

## Discussion

Discussion The following code shows the result of linearly interpolating a lookup table that contains the values [-10, 0, 100] using the offsets [0, 0.5, 1, 1.5, 2].  The integer offsets, 0, 1, and 2, return the corresponding values in the lookup table, -10, 0, and 2. The noninteger offsets, 0.5 and 1.5, return the linearly interpolated values between the lookup table values, -5 and 50. let lookupTable: [Double] = [-10, 0, 100] let offsets: [Double] = [0, 0.5, 1, 1.5, 2]

let result = vDSP.linearInterpolate(lookupTable: lookupTable,                                     withOffsets: offsets)

// Prints "[-10.0, -5.0, 0.0, 50.0, 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)