How to convert an integer array to a matrix in c#

Question

I have an integer array named resp I want to rewrite/convert it as/to a row matrix with name resp.

int[] resp= {1, 0, 1, 0};

I am using the Mathnet.Numerics library.

How can I do that?

What is the definition of the array resp? You've provided literally none of the information anyone would need to give you an applicable answer. — jdphenix
– jdphenix, Commented May 12, 2015 at 4:55
That already looks like a row matrix (row vector?) of [1, 0, 1, 0]. What is your intended output? — jdphenix
– jdphenix, Commented May 12, 2015 at 5:07
output will be same as [1, 0, 1, 0]; only the object type should change. — Artiga
– Artiga, Commented May 12, 2015 at 5:09
Okay, so what type are what wanting to convert it to? As far as I know, .NET doesn't have a specific type to represent a row vector, but an array as you have now is a reasonable approximation. Are you using a library that you've not included information about in your question? — jdphenix
– jdphenix, Commented May 12, 2015 at 5:12
I've edited in the critical minimum information necessary for anyone to give you a reasonable answer for your question. In the future, please do your best to include this information in your question's first iteration. Thank you! — jdphenix
– jdphenix, Commented May 12, 2015 at 5:19

jdphenix · Accepted Answer · 2015-05-12 05:33:20Z

2

In Mathnet, you are not able to initialize an array of integers. As it is, there's in limited support available for this. If you tried, you would get this:

Unhandled Exception: System.TypeInitializationException: The type initializer 
for 'MathNet.Numerics.LinearAlgebra.Vector`1' threw an exception. ---> 
System.NotSupportedException: Matrices and vectors of type 'Int32' 
are not supported. Only Double, Single, Complex or Complex32 are supported at this point.

You can initialize a vector with similar values (with doubles) like this:

var resp = new [] {1.0, 0.0, 1.0, 0.0};
var V = Vector<double>.Build;
var rowVector = V.DenseOfArray(resp);

In order to build a matrix, you would need a multi-dimensional array.

answered May 12, 2015 at 5:33

jdphenix

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