R语言图案绘制

每个人都在其他编程语言中找到了一种简单的图案打印方法。但在R语言中，这是一项艰难的任务。本文主要介绍使用R语言及其结构体绘制各种模式。

方法

开始第一个循环，计算行数
为要显示的项目开始第二个循环
打印项目
递增第二个循环直到达到一个条件
递增第一个循环，直到条件为真
继续以这种方式进行

程序1：用数字画一个三角形

stars = c()
  
for(i in 1:5){
  for(j in 1:i+1){
     stars = c(stars, i)
  }
    
  print(stars)
  stars = c()
}

输出

[1] 1
[1] 2 2
[1] 3 3 3
[1] 4 4 4 4
[1] 5 5 5 5 5

程序2：用*画一个三角形

#creating a empty list to store
stars = c()
  
for(i in 1:5){
   for(j in 1:i+1){
      stars = c(stars, "*")
   }
  # line by line printing
  print(stars)
  stars = c()
}

输出

[1] "*"
[1] "*" "*"
[1] "*" "*" "*"
[1] "*" "*" "*" "*"
[1] "*" "*" "*" "*" "*"

程序3：绘制倒三角形

starsrev = c()
i=1
j=5
  
while(i<=5){
  for(j in 1:j){
     starsrev = c(starsrev, "*")
   }
    
  print(starsrev)
    
  starsrev = c()
  
  i=i+1
  j=j-1
}

输出

[1] "*" "*" "*" "*" "*"
[1] "*" "*" "*" "*"
[1] "*" "*" "*"
[1] "*" "*"
[1] "*"

程序4：绘制倒三角形和正常三角形图案

i=1
stars = c()
  
while(i<=5){
  for(j in 1:i+1){
     stars = c(stars, "*")
  }
  
  print(stars)
  stars = c()
  i=i+1
}
  
starsrev = c()
i=1
j=5
  
while(i<=5){
  for(j in 1:j){
    starsrev = c(starsrev, "*")
  }
    
  print(starsrev)
  starsrev = c()
  i=i+1
  j=j-1
}

输出

[1] "*"
[1] "*" "*"
[1] "*" "*" "*"
[1] "*" "*" "*" "*"
[1] "*" "*" "*" "*" "*"
[1] "*" "*" "*" "*" "*"
[1] "*" "*" "*" "*"
[1] "*" "*" "*"
[1] "*" "*"
[1] "*"