reshape 包掩码防止熔化命名列

Question

我有一个脚本同时需要 reshape和 reshape2图书馆。我知道这是不好的做法，但我认为 plyr (或我正在使用的另一个库)Vennerable正在加载 reshape我个人使用过 reshape2在很多地方。

问题在于reshape2的屏蔽来自 reshape导致 melt 出现问题功能

# Example data frame
df <- data.frame(id=c(1:5), a=c(rnorm(5)), b=c(rnorm(5)))

# With just reshape2, variable and value columns are labelled correctly
library(reshape2)
melt(df, measure.vars=c("a", "b"), variable.name="type", value.name="distance")
   id type   distance
1   1    a -2.0233666
2   2    a  0.4625188
3   3    a -2.8688127
4   4    a  0.8151644
5   5    a -0.4574464
6   1    b  1.3197784
7   2    b  1.6213146
8   3    b  1.3508913
9   4    b -1.6483839
10  5    b -1.1342157

# But my script also has reshape loaded
library(reshape)
Loading required package: plyr

Attaching package: ‘reshape’

The following object(s) are masked from ‘package:plyr’:

    rename, round_any

The following object(s) are masked from ‘package:reshape2’:

    colsplit, melt, recast

# When calling melt in this environment, variable and value columns stick to 
# their default names
melt(df, measure.vars=c("a", "b"), variable.name="type", value.name="distance")
   id variable      value
1   1        a -2.0233666
2   2        a  0.4625188
3   3        a -2.8688127
4   4        a  0.8151644
5   5        a -0.4574464
6   1        b  1.3197784
7   2        b  1.6213146
8   3        b  1.3508913
9   4        b -1.6483839
10  5        b -1.1342157

我想我可以专门打电话 melt来自 reshape2使用 reshape2::melt但我仍然遇到同样的问题。

有没有简单的方法来解决这个问题？如果不是，我将不得不在每次熔断调用后直接手动重新标记列名称。

Answer 1

使用 reshape2:::melt.data.frame(...) .
melt实际上是一种方法:

> reshape2::melt
function (data, ..., na.rm = FALSE, value.name = "value") 
{
    UseMethod("melt", data)
}
<environment: namespace:reshape2>

因此，对于数据框，R 将搜索 melt.data.frame ，在 reshape :

> melt.data.frame
function (data, id.vars, measure.vars, variable_name = "variable", 
    na.rm = !preserve.na, preserve.na = TRUE, ...) 
{
    ...
}
<environment: namespace:reshape>

不过，正如我所指出的，最好的解决方案可能只是升级所有内容。确实是 plyr用于加载 reshape ，但现在没有了。 (编辑:我在想 ggplot2。)