Question

我有以下数据框：

df1
 factory DC       `tariff springtouw`
  <chr>   <chr>                  <dbl>
1 Poznan  Bismarck                3000
2 Poznan  Houston                 3000
3 Poznan  Memphis                 2400
4 Poznan  Albany                  1000
5 Poznan  Seattle                 3500

df2
            Som_Product pallets kosten
duikscooter      379312   37932       
yoga              75651     226       
springtouw      1162413    9687   #    
stoel           1300512    3252       
blender         1400148    2917

我想将 df1 的 3500 乘以 df2 的 9687，并将 df2 中的值附加到 # 处。

这样的代码： df2$kosten[springtouw,] <- df1$tariff springtouw[5,3] * df2$pallets[3,2]

可能的输出

output
df2
            Som_Product pallets kosten
duikscooter      379312   37932       
yoga              75651     226       
springtouw      1162413    9687 33904500   
stoel           1300512    3252       
blender         1400148    2917

Answer 1

rhs 应该是行/列索引或属性，当我们将列提取为 vector 时，它没有行/列属性，即它只是一个一维向量可以使用单个整数值进行索引以在索引指定的位置提取该元素

df2['springtouw', 'kosten'] <- df1$`tariff springtouw`[5] * df2$pallets[3]

-输出

df2
#            Som_Product pallets   kosten
#duikscooter      379312   37932         
#yoga              75651     226         
#springtouw      1162413    9687 33904500
#stoel           1300512    3252         
#blender         1400148    2917

数据

df1 <- structure(list(factory = c("Poznan", "Poznan", "Poznan", "Poznan", 
"Poznan"), DC = c("Bismarck", "Houston", "Memphis", "Albany", 
"Seattle"), `tariff springtouw` = c(3000L, 3000L, 2400L, 1000L, 
3500L)), class = "data.frame", row.names = c("1", "2", "3", "4", 
"5"))

df2 <- structure(list(Som_Product = c(379312L, 75651L, 1162413L, 1300512L, 
1400148L), pallets = c(37932L, 226L, 9687L, 3252L, 2917L), kosten = c("", 
"", "", "", "")), row.names = c("duikscooter", "yoga", "springtouw", 
"stoel", "blender"), class = "data.frame")

将两个数据帧中的值相乘并附加到一个数据帧中

1 个答案:

数据