用 R 计算范围内向量值的数量

在本文中，我们将看到如何计算 R 中给定范围内存在的向量值的数量。要实现此功能，我们可以遵循以下方法。

方法

• 创建矢量
• 设定范围
• 遍历向量
• 检查范围内的元素
• 添加它们
• 显示总和

下面给出使用这种方法的实现。

示例 1：

R

# declaring a integer point vector 
vec <- c(1,12,3,14,-1,-3)
  
# specifying the range to check the element in
min_range = -2
max_range = 8
  
# computing the size of the vector
size = length(vec)
  
# declaring sum =0 as the count of elements in range 
sum = 0 
  
# looping over the vector elements
for(i in 1:size)
 {
    
  # check if elements lies in the range provided
  if(vec[i]>=min_range && vec[i]<=max_range)
    
  # incrementing count of sum if condition satisfied
  sum =sum+1
      
 }
  
print ("Sum of elements in range : ")
print (sum)

---

---

输出

[1] “Sum of elements in range : “

[1] 3

示例 2：

电阻

# declaring a integer point vector 
vec <- c(1,12,3,14,-1,-3,0.1)
  
# specifying the range to check the element in
min_range = -2
max_range = 8
print ("Sum of elements in specified range : ")
  
# and operator check if the element is less than
# max rannge and greater than min range 
sum(vec>min_range & vec

输出

[1] “Sum of elements in specified range : “

[1] 4

但是，如果向量的任何元素为 NA，则 sum() 方法返回 NA 作为输出。通过指定 na.rm=TRUE 可以忽略它。

示例 3：

电阻

# declaring a integer point vector 
vec <- c(1,12,3,14,NA,-3,0.1)
  
# specifying the range to check the element in
min_range = -2
max_range = 8
print ("Sum of elements in specified range without ignoring NA: ")
  
# and operator check if the element is less than
# max rannge and greater than min range 
sum(vec>min_range & vecmin_range & vec

输出

[1] “Sum of elements in specified range without ignoring NA: “

[1] NA

[1] “Sum of elements in specified range ignoring NA: “

[1] 3