RectangleSum Command

RectangleSum[ <Function>, <Start x-Value>, <End x-Value>, <Number of Rectangles>, <Position for rectangle start> ]

Calculates the sum of rectangles with left height starting at a fraction d (0 ≤ d ≤ 1) of each interval, using n rectangles.

When d = 0 it is equivalent to the LeftSum command, and when d = 1 it computes the right sum of the given function.

Note:

• This command draws the rectangles of the left sum as well.
  
• See also the commands: UpperSum, LowerSum, LeftSum , TrapezoidalSum