public RandCursor(AppendRowsDataView parent, Func <int, bool> needCol, IRandom rand, int[] counts)
: base(parent)
{
Ch.AssertValue(needCol);
Ch.AssertValue(rand);
_rand = rand;
Ch.AssertValue(counts);
Ch.Assert(Sources.Length == counts.Length);
_cursorSet = new IRowCursor[counts.Length];
for (int i = 0; i < counts.Length; i++)
{
Ch.Assert(counts[i] >= 0);
_cursorSet[i] = parent._sources[i].GetRowCursor(needCol, RandomUtils.Create(_rand));
}
_sampler = new MultinomialWithoutReplacementSampler(Ch, counts, rand);
_currentSourceIndex = -1;
for (int c = 0; c < Getters.Length; c++)
{
if (needCol(c))
{
Getters[c] = CreateGetter(c);
}
}
}
public RandCursor(AppendRowsDataView parent, IEnumerable <Schema.Column> columnsNeeded, Random rand, int[] counts)
: base(parent)
{
Ch.AssertValue(rand);
_rand = rand;
Ch.AssertValue(counts);
Ch.Assert(Sources.Length == counts.Length);
_cursorSet = new RowCursor[counts.Length];
for (int i = 0; i < counts.Length; i++)
{
Ch.Assert(counts[i] >= 0);
_cursorSet[i] = parent._sources[i].GetRowCursor(columnsNeeded, RandomUtils.Create(_rand));
}
_sampler = new MultinomialWithoutReplacementSampler(Ch, counts, rand);
_currentSourceIndex = -1;
foreach (var col in columnsNeeded)
{
Getters[col.Index] = CreateGetter(col.Index);
}
}
