重新访问：geom_path：每个组仅包含一个观察值。您是否需要调整小组审美？ [英] Revisit: geom_path: Each group consists of only one observation. Do you need to adjust the group aesthetic?

问题描述

使用此数据框，我尝试使用以下代码：

Using this data frame, I attempted to create a simple line graph using the following code:

crypto_data<-
  crypto_data %>% gather(Cryptocurrencies, USD_Exchange, -Date)

ggplot(data = crypto_data) +
  geom_line(aes(x = Date, y = USD_Exchange, colour = Cryptocurrencies))

这显然产生了众所周知的错误。

This produced the, apparently, well known error.

访问：geom_path：每组仅包含一个观察值。您需要调整小组的审美吗？

Revisit: geom_path: Each group consists of only one observation. Do you need to adjust the group aesthetic?

我知道这个问题在这里得到了最明显的解决：

I am aware that this question has been addressed most notably here:

ggplot2折线图给出 geom_path：每组仅包含一个观察值。您是否需要调整组的审美？

但是，我绘制的图形不仅仅是一个变量。（即使Litecoin USD上的数据汇率仅在以后才开始，它在引入之前为零。）我也很注意在ggplot中的es（）中规定组（请参见代码）。该命令生成的图形具有正确的轴标签和键，但绘图区为空白。

However, I am graphing more than a single variable.(Even though the data on the Litecoin USD exchange rate only starts at a later date it takes the value of zero prior to its introduction) I have also been mindful of stipulating the groups within aes() in ggplot (see the code). The command produces a graph with the correct axis lables and key, but a blank plotregion.

有人看到任何明显的错误或有解决办法吗？先感谢您。

Does anyone see any obvious errors or perhaps have a solution? Thank you in advance.

推荐答案

感谢编辑建议，找到了解决方案！

Thanks for the edit suggestion, have found a solution!

crypto_data <-
crypto_data %>% gather(Cryptocurrencies, USD_Exchange, -Date)
ggplot(data=crypto_data) +
geom_line(aes(x=as.numeric(Date), y = USD_Exchange, colour = Cryptocurrencies)

使Date变量（这是一个因子变量）成为数字...

Just had to make the Date variable (that was a factor variable) numeric...

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