public void CumulativeMax(PrimitiveColumnContainer <DateTime> column)
{
var ret = column.Buffers[0].ReadOnlySpan[0];
for (int b = 0; b < column.Buffers.Count; b++)
{
var buffer = column.Buffers[b];
var mutableBuffer = DataFrameBuffer <DateTime> .GetMutableBuffer(buffer);
var mutableSpan = mutableBuffer.Span;
var readOnlySpan = buffer.ReadOnlySpan;
for (int i = 0; i < readOnlySpan.Length; i++)
{
var val = readOnlySpan[i];
if (val > ret)
{
ret = val;
}
mutableSpan[i] = ret;
}
column.Buffers[b] = mutableBuffer;
}
}
public void CumulativeMax(PrimitiveColumnContainer <DateTime> column, IEnumerable <long> rows)
{
var ret = default(DateTime);
var mutableBuffer = DataFrameBuffer <DateTime> .GetMutableBuffer(column.Buffers[0]);
var span = mutableBuffer.Span;
long minRange = 0;
long maxRange = ReadOnlyDataFrameBuffer <DateTime> .MaxCapacity;
long maxCapacity = maxRange;
IEnumerator <long> enumerator = rows.GetEnumerator();
if (enumerator.MoveNext())
{
long row = enumerator.Current;
if (row < minRange || row >= maxRange)
{
int bufferIndex = (int)(row / maxCapacity);
mutableBuffer = DataFrameBuffer <DateTime> .GetMutableBuffer(column.Buffers[bufferIndex]);
span = mutableBuffer.Span;
minRange = checked (bufferIndex * maxCapacity);
maxRange = checked ((bufferIndex + 1) * maxCapacity);
}
row -= minRange;
ret = span[(int)row];
}
while (enumerator.MoveNext())
{
long row = enumerator.Current;
if (row < minRange || row >= maxRange)
{
int bufferIndex = (int)(row / maxCapacity);
mutableBuffer = DataFrameBuffer <DateTime> .GetMutableBuffer(column.Buffers[bufferIndex]);
span = mutableBuffer.Span;
minRange = checked (bufferIndex * maxCapacity);
maxRange = checked ((bufferIndex + 1) * maxCapacity);
}
row -= minRange;
var val = span[(int)row];
if (val > ret)
{
ret = val;
}
span[(int)row] = ret;
}
}
