Donchian Channel Lower [DCL]

Summary:
This indicator script measures the lowest price of an underlying symbol in a specified number of periods.

Calculation:
The lowest low in a specified number of periods of the underlying symbol.

Developer:
Richard Donchian

Interpretation: 
1. Support: When the underlying symbol is moving downwards towards the indicator script, the underlying symbol is likely to reverse direction and move upwards.
2. Support Broken: When the underlying symbol breaks support by crossing below the indicator script, the underlying symbol is likely to continue moving downwards. 

	 ' Assign the parameters to script variables.
	_symbolIndex = symbolIndex
	_periods = periods

	 ' Get the lowest prices of the current symbol, indexed by bar index. 
	Define low() As Number = BarLow(_symbolIndex, barIndex, length + _periods)
	Define min As Number
	 ' Use for the calculated Donchian Channel Lower values, indexed by bar index.
	Define results(length - 1) As Number
	 ' Calculate the Donchian Channel Lower values for the specified bar range.
	For i As Integer = length - 1 To 0 Step -1
		min = 1000000
		 ' Calculate the Donchian Channel Lower value for the current bar.
		For j As Integer = i + _periods - 1 To i Step -1
			If (low(j) < min) Then
				min = low(j)
			End If
		Next
		results(i) = min
	Next
	Return results