使用ggplot2的apply函数为data.frame中的多个变量创建条形图 [英] using an apply function with ggplot2 to create bar plots for more than one variable in a data.frame
问题描述
有没有一种方法可以在R中使用apply函数,以便使用 ggplot2
创建条形图?
Is there a way to use an apply function in R in order to create barplots with ggplot2
?
说,我们有一个仅包含因子变量的数据框,其中一个是布尔值.就我而言,我有一个带有+40个变量的日期框架.可以用一行代码将所有变量与布尔值相对应吗?
Say, we have a dataframe containing only factor variables out of which one is boolean. In my case I have a dateframe with +40 variables. Can one plot all the variables against the boolean one with a single line of code?
data("diamonds")
factors <- sapply(diamonds, function(x) is.factor(x))
factors_only <- diamonds[,factors]
factors_only$binary <- sample(c(1, 0), length(factors_only), replace=TRUE)
factors_only$binary <- as.factor(factors_only$binary)
但是我想创建像这样的条形图:
But I want to create barplots like this one:
qplot(factors_only$color, data=factors_only, geom="bar", fill=factors_only$binary)
这不起作用:
sapply(factors_only,function(x) qplot(x, data=factors_only, geom="bar", fill=binary))
请告知
推荐答案
您可以使用 lapply
遍历变量名,然后使用 get
提取当前变量变量.
You can use lapply
to run through the variable names and then use get
to pull up the current variable.
temp <- lapply(names(factors_only),
function(x) qplot(get(x), data=factors_only, geom="bar", fill=binary, xlab=x))
要打印列表项,
print(temp[[1]])
会产生
遍历变量名的一个不错的功能是,您可以使用它们来动态命名图中的标签.
A nice feature of running through the variable names is that you can use these to dynamically name the labels in the figure.
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