trapezoid: A function that calculates the area under a curve based on...

In RCASPAR: A package for survival time prediction based on a piecewise baseline hazard Cox regression model.

Description

A function that calculates the approximate value of the definite integral of a continuous function. In other words, it can help plot the area under the curve of the plotted function between two limits.

Usage

trapezoid(x, y)

Arguments

x	The values to be used along the x-axis while plotting the curve of the function. The x in f(x)=y
y	The values to be used along the y-axis while plotting the curve of the function. The y in the f(x)=y.

Value

The area under the curve plotted with the x and y values provided as arguments.

Note

Using this method is slightly less accurate than using the simpson integration method

Author(s)

Douaa Mugahid

References

Weisstein, Eric W. "Trapezoidal Rule." From MathWorld–A Wolfram Web Resource. http://mathworld.wolfram.com/TrapezoidalRule.html

See Also

simpson

Examples

x <- seq(0:20)
y <- seq(0, 100, 1)
trapezoid(x,y)

Example output

[1] 5000

RCASPAR documentation built on Nov. 8, 2020, 6:56 p.m.