Contents

linearInterpolate(lookupTable:withOffsets:scale:baseOffset:)

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

Declaration

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

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

The result of the interpolation operation.

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: [Float] = [-10, 0, 100]
let offsets: [Float] = [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