Mid point method for numerical integration

MIDPOINT method. Some numerical calculations and analysis exercises for Numeric Integration.

HELP. MIDPOINT method. Some numerical calculations and analysis exercises of Numeric Integration for comparison analysis. f function is given in terms of a symbolic variable x and as an inline function. E.g., f=inline('x^2+2*x-2'). Also, if the function f is trigonometric function, the 4th argument can be entered as 'trigonom' or just 'trig' or 1. X is expected to be in degrees for trigonometric function evaluations. upl and lowl are upper and lower limits. NB: A sequence order of limits is unnecessary to follow, 'if' conditions will take care of lower and upper limits accordingly.