[Fact] public void ZeroRectMatrix()
{
var m = MathS.Matrix(new Entity[, ] {
{ 0, 0, 0 },
{ 0, 0, 0 }
});
Assert.Equal(m, MathS.ZeroMatrix(2, 3));
}
[Fact] public void WithMatrix1()
{
var m = MathS.ZeroMatrix(6).With
((r, c, e) => (r, c, e) switch
{
(_, < 1, _) => 1,
(>= 1 and <= 4, >= 1 and <= 3, _) => 2,
(>= 1 and <= 4, > 3, _) => 3,
(5, 5, _) => 4,
_ => e
});