Is there an equivalent to numpy fft.irfft?

Thank you to produce this library. Does it contain an equivalent to numpy fft.irfft? I did find the complex inverse.
https://numpy.org/doc/stable/reference/generated/numpy.fft.irfft.html

I am a C# programmer, so I understand how to convert from in-place to generating a new array.

Hi @FrankHileman, thank you for this question!

Presently no, FftSharp does not have an irfft function. I'd be happy to add one in though!

I would probably name it InverseReal() It could live alongside the ForwardReal() function:

FftSharp/src/FftSharp/FFT.cs

Lines 64 to 74 in 6f341bb

    
           /// <summary> 
        
           /// Calculate FFT and return just the real component of the spectrum 
        
           /// </summary> 
        
           public static System.Numerics.Complex[] ForwardReal(double[] samples) 
        
           { 
        
               System.Numerics.Complex[] buffer = samples.ToComplexArray(); 
        
               Forward(buffer); 
        
               System.Numerics.Complex[] real = new System.Numerics.Complex[samples.Length / 2 + 1]; 
        
               Array.Copy(buffer, 0, real, 0, real.Length); 
        
               return real; 
        
           }

If you wish to add this and create a pull request, I would be happy to merge it in and publish a new package with this feature

Hello @swharden, Thank you for the reply. I am still reading about how to convert an inverse complex method into an inverse real method, so I am not in a position to implement it immediately. From what I understand, it is not as simple as converting an array of doubles to an array of Complex.

	/// <summary>
	/// Calculate FFT and return just the real component of the spectrum
	/// </summary>
	public static System.Numerics.Complex[] ForwardReal(double[] samples)
	{
	System.Numerics.Complex[] buffer = samples.ToComplexArray();
	Forward(buffer);
	System.Numerics.Complex[] real = new System.Numerics.Complex[samples.Length / 2 + 1];
	Array.Copy(buffer, 0, real, 0, real.Length);
	return real;
	}