我想在值是字符串的地方使用pivot_wider或spread。
这里是一个例子:
a <- c("a", "a", "b", "c", "c", "c")
x <- c("x", "y", "y", "x", "y", "z")
m <- cbind(a,x)
> m
a x
[1,] "a" "x"
[2,] "a" "y"
[3,] "b" "y"
[4,] "c" "x"
[5,] "c" "y"
[6,] "c" "z"
我想要的输出是:
V1 V2 V3 V4
one a x y <NA>
two b y <NA> <NA>
three c x y z
但是,我的老去,传播,不起作用:
> as.data.frame(m) %>% spread(key = a, value = x)
Error: Each row of output must be identified by a unique combination of keys.
Keys are shared for 5 rows:
* 1, 2
* 4, 5, 6
pivot_wider也没有:
as.data.frame(m) %>%
group_by(a) %>%
mutate(namer = n()) %>%
ungroup() %>%
pivot_wider(#id_cols = a,
names_from = namer,
values_from = x,
values_fill = list(namer = "none"),
names_prefix = "City")
有什么建议吗?
@ akrun谢谢你的回答,这里有很多事情要做,这就是我将其缩小到的范围:
m <- data.frame(a, x)
m %>% group_by(a) %>%
mutate(rn = str_c("V", row_number()+1)) %>%
ungroup %>%
pivot_wider(names_from = rn, values_from = x)
作品。但是,>
m %>% group_by(a) %>% mutate(rn = n()) %>% ungroup %>% pivot_wider(names_from = rn, values_from = x, names_prefix = "V")
没有。看来问题是我使用数字作为名称,并使用names_prefix将其转换为字符。这也是您的理解吗?
我想在值是字符串的情况下使用pivot_wider或spread。这是一个示例:a ...
我们可以创建data.frame
而不是matrix
(cbind
创建matrix
)