R语言FOR循环打印9*9乘法表

使用for循环打印99乘法表时，需要两重循环，第一重循环乘数，第二重循环表示被乘数，打印当乘数大于等于被乘数时的结果，并在每次第二重循环结束时换行。

for(x in c(1:9)){
  for(y in c(1:9)){
    if(x>=y){
      z<-x*y
      cat(x,"*",y,"=",z," ")
    } 
  }
  cat("n")
}

> for(x in c(1:9)){
+   for(y in c(1:9)){
+     if(x>=y){
+       z<-x*y
+       cat(x,"*",y,"=",z," ")
+     } 
+   }
+   cat("n")
+ }
1 * 1 = 1  
2 * 1 = 2  2 * 2 = 4  
3 * 1 = 3  3 * 2 = 6  3 * 3 = 9  
4 * 1 = 4  4 * 2 = 8  4 * 3 = 12  4 * 4 = 16  
5 * 1 = 5  5 * 2 = 10  5 * 3 = 15  5 * 4 = 20  5 * 5 = 25  
6 * 1 = 6  6 * 2 = 12  6 * 3 = 18  6 * 4 = 24  6 * 5 = 30  6 * 6 = 36  
7 * 1 = 7  7 * 2 = 14  7 * 3 = 21  7 * 4 = 28  7 * 5 = 35  7 * 6 = 42  7 * 7 = 49  
8 * 1 = 8  8 * 2 = 16  8 * 3 = 24  8 * 4 = 32  8 * 5 = 40  8 * 6 = 48  8 * 7 = 56  8 * 8 = 64  
9 * 1 = 9  9 * 2 = 18  9 * 3 = 27  9 * 4 = 36  9 * 5 = 45  9 * 6 = 54  9 * 7 = 63  9 * 8 = 72  9 * 9 = 81