Trapezoidal Rule - Maple Programming Help

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Trapezoidal Rule

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

ApproximateInt(f(x), x = a..b, method = trapezoid, opts)

ApproximateInt(f(x), a..b, method = trapezoid, opts)

ApproximateInt(Int(f(x), x = a..b), method = trapezoid, opts)

Parameters

f(x)

-

algebraic expression in variable 'x'

x

-

name; specify the independent variable

a, b

-

algebraic expressions; specify the interval

opts

-

equation(s) of the form option=value where option is one of boxoptions, functionoptions, iterations, method, outline, output, partition, pointoptions, refinement, showarea, showfunction, showpoints, subpartition, view, or Student plot options; specify output options

Description

• 

The ApproximateInt(f(x), x = a..b, method = trapezoid) command approximates the integral of f(x) from a to b by using the trapezoidal Rule. The first two arguments (function expression and range) can be replaced by a definite integral.

• 

If the independent variable can be uniquely determined from the expression, the parameter x need not be included in the calling sequence.

• 

Given a partition P=a=x0,x1,...,xN=b of the interval a,b, the trapezoidal rule approximates the integral on each subinterval xi1,xi by integrating the linear function that interpolates the endpoints xi1,fxi1 and xi,fxi.  This value is

12xixi1fxi1+fxi

• 

In the case that the widths of the subintervals are equal, the approximation can be written as

12bafx0+2fx1+2fx2+...+2fxN1+fxNN

• 

By default, the interval is divided into 10 equal-sized subintervals.

• 

For the options opts, see the ApproximateInt help page.

• 

This rule can be applied interactively, through the ApproximateInt Tutor.

Examples

polynomialCurveFitting[PolynomialInterpolation]x0,x1,f0,f1,z:

integrated∫x0x1polynomialⅆz:

factorintegrated

12x1+x0f1+f0

(1)

withStudent[Calculus1]:

ApproximateIntsinx,x=0..5,method=trapezoid

12sin12+12sin1+12sin32+12sin2+12sin52+12sin3+12sin72+12sin4+12sin92+14sin5

(2)

ApproximateIntxx2x3,x=0..5,method=trapezoid,output=plot

ApproximateInttanx2x,x=1..1,method=trapezoid,output=plot,partition=50

To play the following animation in this help page, right-click (Control-click, on Macintosh) the plot to display the context menu.  Select Animation > Play.

ApproximateIntlnx,1..100,method=trapezoid,output=animation

See Also

Boole's Rules

Newton-Cotes Rules

Simpson's 3/8 Rule

Simpson's Rule

Student

Student plot options

Student[Calculus1]

Student[Calculus1][ApproximateInt]

Student[Calculus1][ApproximateIntTutor]

Student[Calculus1][RiemannSum]

Student[Calculus1][VisualizationOverview]

 


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