R语言 用R计算范围内的向量值的数量

在这篇文章中，我们将看到如何在R中计算给定范围内存在的向量值的数量。为了实现这一功能，我们可以遵循以下方法。

方法

• 创建向量
• 设置范围
• 遍历向量
• 检查在范围内的元素
• 添加它们
• 显示总和

下面给出了使用这种方法的实现。

例1 :

# 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] “范围内的元素之和：”

[1] 3

例2 :

# 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 range and greater than min range
sum(vec>min_range & vec<max_range)

输出

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

[1] 4

然而，如果向量中的任何元素是NA，那么sum()方法的输出就会返回NA。可以通过指定na.rm=TRUE来忽略它。

例3 :

# 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 range and greater than min range
sum(vec>min_range & vec<max_range)
 
print ("Sum of elements in specified range ignoring NA: ")
sum(vec>min_range & vec<max_range,na.rm=TRUE)

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