/// <summary>
/// Gets the statistics of all the values. If the entire content is not currently in-ram,
/// ReadRow will be used to read individual lines and perform the calculations.
/// </summary>
public override void GetStatistics()
{
ProgressMeter pm = new ProgressMeter(ProgressHandler, DataStrings.CalculatingStatistics, NumRows);
T min = Global.MaximumValue <T>();
T max = Global.MinimumValue <T>();
double total = 0;
double sqrTotal = 0;
int count = 0;
if (!IsInRam || !this.IsFullyWindowed())
{
for (int row = 0; row < NumRowsInFile; row++)
{
T[] values = ReadRow(row);
for (int col = 0; col < NumColumnsInFile; col++)
{
T val = values[col];
double dblVal = Global.ToDouble(val);
if (dblVal == NoDataValue)
{
continue;
}
if (val.CompareTo(max) > 0)
{
max = val;
}
if (val.CompareTo(min) < 0)
{
min = val;
}
total += dblVal;
sqrTotal += dblVal * dblVal;
count++;
}
pm.CurrentValue = row;
}
}
else
{
for (int row = 0; row < NumRows; row++)
{
for (int col = 0; col < NumColumns; col++)
{
T val = Data[row][col];
double dblVal = Global.ToDouble(val);
if (dblVal == NoDataValue)
{
continue;
}
if (val.CompareTo(max) > 0)
{
max = val;
}
if (val.CompareTo(min) < 0)
{
min = val;
}
total += dblVal;
sqrTotal += dblVal * dblVal;
count++;
}
pm.CurrentValue = row;
}
}
Value.Updated = false;
Minimum = Global.ToDouble(min);
Maximum = Global.ToDouble(max);
Mean = total / count;
NumValueCells = count;
StdDeviation = (float)Math.Sqrt((sqrTotal / NumValueCells) - (total / NumValueCells * (total / NumValueCells)));
pm.Reset();
}