Composite Trapezoid method for numeric integration

COMPOSITE trapezoid Method for numerical calculations & analysis in numeric integration.

COMPOSITE trapezoid Method for numerical calculations & analysis exercises in Numeric Integration. 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 trigenometric 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, lowl, ngrid are upper and lower limits and number of grids. A sequence order of upper and lower limits is not needed to follow; since 'if' conditions will take care of that issue.