I'm new to MathNet
and implementing a code in C#.Net
.
There is a vector:
var X = new DenseVector(new double[] { 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150 });
I need to find Y = **diff(X)**
calculating differences between adjacent elements of X
like:
Y = [X(2)-X(1) X(3)-X(2) ... X(m)-X(m-1)]
Is there built-in function diff() available in MathNet
? I searched on MathNet.Numerics/Differentiate , but its not available.
You are correct. It does not appear to be available. But here is a simple function to achieve that.
public MathNet.Numerics.LinearAlgebra.Double.DenseVector
Diff(MathNet.Numerics.LinearAlgebra.Double.DenseVector X)
{
var R = new MathNet.Numerics.LinearAlgebra.Double.DenseVector(X.Count - 2);
for (var i = 0; i <= X.Count - 2; i++)
R(i) = X(i + 1) - X(i);
return R;
}
You can use advantages of MathNet
to make it more expressive.
static class VectorExtension
{
public static Vector<double> Differentiate(this Vector<double> vector)
{
var high = Vector<double>.Build.DenseOfEnumerable(vector.Skip(1));
var low = Vector<double>.Build.DenseOfEnumerable(vector.Take(vector.Count - 1));
return high - low;
}
}
Then
var X = new DenseVector(new double[] { 10, 20, 30, 40, 50, 60, 70 });
Console.WriteLine(X.Differentiate());
Gives
DenseVector 6-Double
10
10
10
10
10
10
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