public static (matrix, vector) Eigens(MatrixExpression a)
{
var v = a.Evaluate();
if (v.Rows != v.Cols)
{
ThrowHelper.ThrowIncorrectDimensionsForOperation();
}
if (a is MatrixInput)
{
v = Copy(v);
}
var w = new vector(v.Rows);
ThrowHelper.Check(Lapack.syev(Layout.ColMajor, 'V', UpLoChar.Lower, v.Rows, v.Array, v.Rows, w.Array));
return(v, w);
}
