OpenCvSharp.NativeMethods.core_PCA_computeVar C# (CSharp) Method

        public static extern void core_PCA_computeVar(IntPtr obj, IntPtr data, IntPtr mean,
            int flags, double retainedVariance);
        [DllImport(DllExtern, CallingConvention = CallingConvention.Cdecl, EntryPoint = "core_PCA_project1")]

 /// <summary>
 /// operator that performs PCA. The previously stored data, if any, is released
 /// </summary>
 /// <param name="data"></param>
 /// <param name="mean"></param>
 /// <param name="flags"></param>
 /// <param name="retainedVariance"></param>
 /// <returns></returns>
 public PCA ComputeVar(InputArray data, InputArray mean, Flags flags, double retainedVariance)
 {
     ThrowIfDisposed();
     if (data == null)
     {
         throw new ArgumentNullException(nameof(data));
     }
     if (mean == null)
     {
         throw new ArgumentNullException(nameof(mean));
     }
     data.ThrowIfDisposed();
     mean.ThrowIfDisposed();
     NativeMethods.core_PCA_computeVar(ptr, data.CvPtr, mean.CvPtr, (int)flags, retainedVariance);
     return(this);
 }