在 R 编程中计算一个区间内方程的根 – uniroot()函数

R 语言中的uniroot()函数用于计算方程的根，其中区间的下限和上限作为参数传递。

Syntax: uniroot(fun, interval, lower, upper)

Parameters:
fun: function with the equation
interval: with upper and lower range of root
lower: lower end point of the interval
upper: upper end point of the interval

示例 1：

# R program to calculate root of an equation
  
# Function with equation
fun <- function(x) {2 * x ^ 2 - 4 * x -10}
  
# Calling uniroot() function
uniroot(fun, lower = 0, upper = 4)

输出：

$root
[1] 3.449485

$f.root
[1] -4.310493e-05

$iter
[1] 5

$init.it
[1] NA

$estim.prec
[1] 6.103516e-05

示例 2：

# R program to calculate root of an equation
  
# Function with equation
fun <- function(x) {2 * x ^ 2 - 4 * x -10}
  
# Calling uniroot() function
uniroot(fun, c(0, 4))$root
uniroot(fun, lower = -4, upper = 0)$root

输出：

[1] 3.449485
[1] -1.44949