/// <summary>
/// Arranges the FFT values to have 0 as the center frequency
/// </summary>
/// <param name="fftvalues">Array of type ComplexF which contain the FFT values of a Signal</param>
/// <returns>FFT values with the halves of the argument fftvalues swapped</returns>
public static Complex[] FFTShift(Complex[] fftvalues)
{
int half = fftvalues.Length / 2;
Complex[] f_half = new ArraySegment<Complex>(fftvalues, 0, half).ToArray();
Complex[] s_half = new ArraySegment<Complex>(fftvalues, half, fftvalues.Length / 2).ToArray();
Complex[] retval = s_half.Concat(f_half).ToArray();
return retval;
}
/// <summary>
/// Arranges the FFT values to have 0 as the center frequency
/// </summary>
/// <param name="fftvalues">Array of type ComplexF which contain the FFT values of a Signal</param>
/// <returns>FFT values with the halves of the argument fftvalues swapped</returns>
public static Complex[] FFTShift(Complex[] fftvalues)
{
int half = fftvalues.Length / 2;
Complex[] f_half = new ArraySegment <Complex>(fftvalues, 0, half).ToArray();
Complex[] s_half = new ArraySegment <Complex>(fftvalues, half, fftvalues.Length / 2).ToArray();
Complex[] retval = s_half.Concat(f_half).ToArray();
return(retval);
}
private static int[] LeftRotateArr(int rotations, int[] inArr)
{
if (rotations > inArr.Length)
{
rotations = inArr.Length % rotations;
}
ArraySegment <int> iGreaterThanRotations = new ArraySegment <int>(inArr
, rotations
, inArr.Length - rotations);
ArraySegment <int> iLessThanRotations = new ArraySegment <int>(inArr
, 0
, rotations);
int[] rotatedArr = iGreaterThanRotations.Concat <int>(iLessThanRotations).ToArray <int>();
return(rotatedArr);
}
public static void RotateArray(ref int[] nums, int k)
{
if (nums == null)
{
return;
}
if (k <= 0 || nums.Length == 0 || k >= nums.Length)
{
return;
}
var segment1 = new ArraySegment <int>(nums, 0, k);
var segment2 = new ArraySegment <int>(nums, k, nums.Length - k);
nums = segment2.Concat(segment1).ToArray();
}