mathnet-numerics/src/Numerics/LinearAlgebra/VectorExtensions.cs

// <copyright file="VectorExtensions.cs" company="Math.NET">
// Math.NET Numerics, part of the Math.NET Project
// http://numerics.mathdotnet.com
// http://github.com/mathnet/mathnet-numerics
// http://mathnetnumerics.codeplex.com
//
// Copyright (c) 2009-2015 Math.NET
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
// </copyright>

namespace MathNet.Numerics.LinearAlgebra
{
#if NOSYSNUMERICS
    using Complex64 = Numerics.Complex;
#else
    using Complex64 = System.Numerics.Complex;
#endif

    public static class VectorExtensions
    {
        /// <summary>
        /// Converts a vector to single precision.
        /// </summary>
        public static Vector<float> ToSingle(this Vector<double> vector)
        {
            return vector.Map(x => (float)x, Zeros.AllowSkip);
        }

        /// <summary>
        /// Converts a vector to double precision.
        /// </summary>
        public static Vector<double> ToDouble(this Vector<float> vector)
        {
            return vector.Map(x => (double)x, Zeros.AllowSkip);
        }

        /// <summary>
        /// Converts a vector to single precision complex numbers.
        /// </summary>
        public static Vector<Numerics.Complex32> ToComplex32(this Vector<Complex64> vector)
        {
            return vector.Map(x => new Numerics.Complex32((float)x.Real, (float)x.Imaginary), Zeros.AllowSkip);
        }

        /// <summary>
        /// Converts a vector to double precision complex numbers.
        /// </summary>
        public static Vector<Complex64> ToComplex(this Vector<Numerics.Complex32> vector)
        {
            return vector.Map(x => new Complex64(x.Real, x.Imaginary), Zeros.AllowSkip);
        }

        /// <summary>
        /// Gets a single precision complex vector with the real parts from the given vector.
        /// </summary>
        public static Vector<Numerics.Complex32> ToComplex32(this Vector<float> vector)
        {
            return vector.Map(x => new Numerics.Complex32(x, 0f), Zeros.AllowSkip);
        }

        /// <summary>
        /// Gets a double precision complex vector with the real parts from the given vector.
        /// </summary>
        public static Vector<Complex64> ToComplex(this Vector<double> vector)
        {
            return vector.Map(x => new Complex64(x, 0d), Zeros.AllowSkip);
        }

        /// <summary>
        /// Gets a real vector representing the real parts of a complex vector.
        /// </summary>
        public static Vector<double> Real(this Vector<Complex64> vector)
        {
            return vector.Map(x => x.Real, Zeros.AllowSkip);
        }

        /// <summary>
        /// Gets a real vector representing the real parts of a complex vector.
        /// </summary>
        public static Vector<float> Real(this Vector<Numerics.Complex32> vector)
        {
            return vector.Map(x => x.Real, Zeros.AllowSkip);
        }

        /// <summary>
        /// Gets a real vector representing the imaginary parts of a complex vector.
        /// </summary>
        public static Vector<double> Imaginary(this Vector<Complex64> vector)
        {
            return vector.Map(x => x.Imaginary, Zeros.AllowSkip);
        }

        /// <summary>
        /// Gets a real vector representing the imaginary parts of a complex vector.
        /// </summary>
        public static Vector<float> Imaginary(this Vector<Numerics.Complex32> vector)
        {
            return vector.Map(x => x.Imaginary, Zeros.AllowSkip);
        }
    }
}