public DataFrame(params DataFrameColumn[] columns)
{
_columnCollection = new DataFrameColumnCollection(columns, OnColumnsChanged);
_rowCollection = new DataFrameRowCollection(this);
}
/// <summary>
/// Constructs a <see cref="DataFrame"/> with <paramref name="columns"/>.
/// </summary>
/// <param name="columns">The columns of this <see cref="DataFrame"/>.</param>
public DataFrame(IEnumerable <DataFrameColumn> columns)
{
_columnCollection = new DataFrameColumnCollection(columns, OnColumnsChanged);
_rowCollection = new DataFrameRowCollection(this);
}