使用ggplot2在分类y轴上绘制：“错误:提供给连续比例的离散值”
使用ggplot2在分类y轴上绘制：“错误:提供给连续比例的离散值”
提问于 2015-03-26 20:13:13
下面的绘图代码给出了Error: Discrete value supplied to continuous scale
这段代码有什么问题？它工作得很好，直到我尝试改变刻度，这样误差就存在了……我试着从类似的问题中找出解决方案，但做不到。
这是我的数据的head：
> dput(head(df))
structure(list(`10` = c(0, 0, 0, 0, 0, 0), `33.95` = c(0, 0,
0, 0, 0, 0), `58.66` = c(0, 0, 0, 0, 0, 0), `84.42` = c(0, 0,
0, 0, 0, 0), `110.21` = c(0, 0, 0, 0, 0, 0), `134.16` = c(0,
0, 0, 0, 0, 0), `164.69` = c(0, 0, 0, 0, 0, 0), `199.1` = c(0,
0, 0, 0, 0, 0), `234.35` = c(0, 0, 0, 0, 0, 0), `257.19` = c(0,
0, 0, 0, 0, 0), `361.84` = c(0, 0, 0, 0, 0, 0), `432.74` = c(0,
0, 0, 0, 0, 0), `506.34` = c(1, 0, 0, 0, 0, 0), `581.46` = c(0,
0, 0, 0, 0, 0), `651.71` = c(0, 0, 0, 0, 0, 0), `732.59` = c(0,
0, 0, 0, 0, 1), `817.56` = c(0, 0, 0, 1, 0, 0), `896.24` = c(0,
0, 0, 0, 0, 0), `971.77` = c(0, 1, 1, 1, 0, 1), `1038.91` = c(0,
0, 0, 0, 0, 0), MW = c(3.9, 6.4, 7.4, 8.1, 9, 9.4)), .Names = c("10",
"33.95", "58.66", "84.42", "110.21", "134.16", "164.69", "199.1",
"234.35", "257.19", "361.84", "432.74", "506.34", "581.46", "651.71",
"732.59", "817.56", "896.24", "971.77", "1038.91", "MW"), row.names = c("Merc",
"Peug", "Fera", "Fiat", "Opel", "Volv"
), class = "data.frame")绘图代码：
## Plotting
meltDF = melt(df, id.vars = 'MW')
ggplot(meltDF[meltDF$value == 1,]) + geom_point(aes(x = MW, y = variable)) +
scale_x_continuous(limits=c(0, 1200), breaks=c(0, 400, 800, 1200)) +
scale_y_continuous(limits=c(0, 1200), breaks=c(0, 400, 800, 1200))以下是添加比例之前的绘图外观：
回答 2
Stack Overflow用户
发布于 2017-12-07 05:19:41
如果x是数字，则添加scale_x_continuous()；如果x是字符/因子，则添加scale_x_discrete()。这可能会解决你的问题。
Stack Overflow用户
发布于 2018-03-26 17:54:33
在我的例子中，您需要将列(您认为此列是数字，但实际上不是)转换为numeric
geom_segment(data=tmpp,
aes(x=start_pos,
y=lib.complexity,
xend=end_pos,
yend=lib.complexity)
)
# to
geom_segment(data=tmpp,
aes(x=as.numeric(start_pos),
y=as.numeric(lib.complexity),
xend=as.numeric(end_pos),
yend=as.numeric(lib.complexity))
)页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/29278153
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