CODEWITHSUNDEEP
c#matlab
Galandil
Galandil

Reputation: 4249

MathNet.Numerics.LinearAlgebra: how to append a Vector to another quickly?

I'm converting an algorithm from Matlab to C#.

At a certain point, there's this new vector in the matlab code:

F = [D * z + v; m1 + rgb];

D is a 36x36 matrix, z and v are 36x1 vectors, m1 and rgb are 3x1 vectors. This means that F is a 39x1 vector.

Now, when converting this code to C# using MathNet, I found out that, apparently, there's no append function, and the best that I could come to is this code:

var F = Vector<float>.Build.Dense(39);
var firstElements = Vector<float>.Build.Dense(36);
var lastElements = Vector<float>.Build.Dense(3);
firstElements = D * z + v;
lastElements = m1 + rgb;
firstElements.CopySubVectorTo(F, 0, 0, firstElements.Count);
lastElements.CopySubVectorTo(F, 0, firstElements.Count, lastElements.Count);

Is there a quicker way to create the F vector?

Upvotes: 1

Views: 2129

Answers (1)

k c
k c

Reputation: 98

Not especially pretty, but this would work:

F = firstElements.ToColumnMatrix().Stack(lastElements.ToColumnMatrix()).Column(0);

It would probably be a good feature to add, a function to Stack 2 vectors.

Upvotes: 2

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