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请原谅我，如果这是一个非常愚蠢的问题。自过去 12 小时以来，我一直在自责，想知道我做错了什么。

我正在尝试使用 ggplot2 中的 facet_grid 和形状来绘制绘图。我正在使用形状在不同年份以不同方式显示点。实际数据集有 7 年的数据点。示例代码数据仅代表 3 年的实际数据。当我不使用形状时，情节是正确的。它在 x 轴上显示正确年份下的点。一旦在 aes 部分中使用了形状，数据点就不是正确的年份。

请帮我解决这个问题。示例代码反映了问题

我在 ubuntu 10.04 LTS 上使用 R 2.14.0 和 ggplot2 0.9.3.1。

library(ggplot2)
library(plyr)

tr_week = c(
  "2006-01-16", "2006-01-16", "2006-01-16", "2006-01-16", "2006-01-16",
  "2006-01-16", "2007-02-19", "2007-02-19", "2007-02-19", "2007-02-19",
  "2007-02-19", "2007-02-19", "2009-08-24", "2009-08-24", "2009-08-24",
  "2009-08-24", "2009-08-24", "2009-08-24"
)

tenor = c(
  "T00-09", "T10", "T11-14", "T15", "T16-29", "T30", "T00-09", "T10", "T11-14", "T15",
  "T16-29", "T30", "T00-09", "T10", "T11-14", "T15", "T16-29", "T30"
)

weeklyTrades = c(
  18, 87, 50, 206, 233, 114, 28, 49, 106, 122, 51, 59, 57, 82, 17, 26, 53, 42
)

tr_year = c(
  "2006", "2006", "2006", "2006", "2006", "2006", "2007", "2007", "2007", "2007",
  "2007", "2007", "2009", "2009", "2009", "2009", "2009", "2009"
)

tr_week = as.Date(tr_week, "%Y-%m-%d")
tenor = factor(tenor)
dfWeek = data.frame(tr_week, tenor, weeklyTrades, tr_year, stringsAsFactors=F)


##### The following plots correctly #############
p = ggplot(dfWeek, aes(tr_week, weeklyTrades, group = 1)) +
    ggtitle("Weekly Trades per Tenure Bucket") +
    xlab("Trading Week") + ylab("weekly Trades")

    p +
    facet_grid(tenor ~ ., scale = "free_y") +
    geom_point(alpha=0.5, size=1.5)

###### The plot is wrong as soon as shape is specified
q = ggplot(dfWeek, aes(tr_week, weeklyTrades, group = 1, shape = factor(dfWeek$tr_year))) +
    scale_shape_manual(name = "Year", values = c(15, 3, 17, 4, 5, 16, 6)) +
    ggtitle("Weekly Trades per Tenure Bucket") +
    xlab("Trading Week") + ylab("weekly Trades")

    q +
    facet_grid(tenor ~ ., scale = "free_y") +
    geom_point(alpha=0.5, size=1.5)
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1 回答 1

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Problem is due to fact that when defining shape= you use factor(dfWeek$tr_year) - so points get shapes in the order as they are in vector dfWeek$tr_year and not the order as they are plotting taking into a count other variables you set in aes() and facet_wrap(). In ggplot() call you already have stated that you will use data frame dfWeek so you don't need to write it again in aes().

To get correct plot use inside aes() just

shape = factor(tr_year)
于 2013-08-20T17:09:01.087 回答