nijnstein / Span2D

Span2D

A Span working on a 2 dimensional array

// create a span2d from an array
Span2D<float> data2d = new float[10,10].AsSpan2D(); 

// direct access through indexer 
float f = data2d[i, j];

// row access throug a span:
Span<float> row = data2d.Row(0); 

// column access via Span2D<T>.ColumnSpan
Span<float> a = stackalloc float[10]; 
data2d.Column[0].CopyTo(a); 

float[] b = data2d.Column[1].ToArray(); 

Column indexing

 var data = new float[2, 2] { { 1, 2 }, { 3, 4 } };
 Span2D<float> s = data.AsSpan2D<float>();
 Assert.IsTrue(s.Column(0)[0] == 1f);
 Assert.IsTrue(s.Column(0)[1] == 3f);
 Assert.IsTrue(s.Column(1)[0] == 2f);
 Assert.IsTrue(s.Column(1)[1] == 4f);
 
 Assert.IsTrue(s.Column(1).Sum() == 6f);