如何在同一图表中绘制2条形图

Question

我有这种格式的数据框。我想绘制每个day_of_week的条形图重叠。

day_of_week clicks impressions
        <int>  <int>       <int>
1           0  65181     3778745
2           1  54658     2912405
3           2  50020     3016874

我正在使用此代码。但它给我一个错误：

ggplot(weekday_count, aes(x=day_of_week)) +                    # basic graphical object
  geom_bar(aes(y=clicks), colour="red") +  # first layer
  geom_bar(aes(y=impressions), colour="green")  # second layer

错误：stat_count（）不得与y美学一起使用。

Answer 1

鉴于您的代码，我认为您正在寻找的是

dd = read.table(text = 'day_of_week clicks impressions

          0  65181     3778745
          1  54658     2912405
          2  50020     3016874', header = T)

dd = melt(dd, id.vars = 'day_of_week')

ggplot(data = dd, aes(x = day_of_week, y = value, fill = variable)) +
  geom_col(alpha = 0.5, position = 'identity')