[英]R shiny modify reactive data frame
I'm trying to build an app in which I can select the data file (input$dataset), then add a new datetime column formatting date and time previous columns to make plots with ggplot2. 我正在尝试构建一个应用程序,在其中可以选择数据文件(input $ dataset),然后添加新的datetime列,以格式化先前的日期和时间来使用ggplot2进行绘图。
I use 'within' that previously worked in batch scripts and in Rstudio. 我使用以前在批处理脚本和Rstudio中使用的“内部”。 But now I get this error message:
但是现在我收到此错误消息:
no applicable method for 'within' applied to an object of class "reactive"
没有适用于“内部”的适用方法应用于“反应”类的对象
How can I apply this method to a reactive object? 如何将此方法应用于反应对象? Should I use another command?
我应该使用其他命令吗? cbind?
cbind? ddply?
ddply?
datos=reactive({
read.csv(input$dataset,header=T,sep=";",na.strings="-99.900")
within(datos, datetime <- as.POSIXct(paste(FECHA,H_SOLAR),format = "%y/%m/%d %H:%M:%S"))
})
Thanks in advance 提前致谢
EDIT: 编辑:
Following the answer below I understand a reactive source can't be modified, say add a column to the data frame. 按照下面的答案,我知道无法修改反应式源,例如在数据框中添加一列。 The point is I want to use ggplot in this way (adapting an old R script):
关键是我想以这种方式使用ggplot(适应旧的R脚本):
p=ggplot(datos(),aes_string(x="datetime", y=input$var,colour="as.character(stat_id)")) +
geom_line()
}
So, how should I add datetime to datos? 那么,我应该如何在datos中添加日期时间? Maybe creating datos2 as a new reactive source merging datos and datetime?
也许创建datos2作为合并datos和datetime的新反应源?
EDIT 2 Added full code to github https://github.com/pacomet/git 编辑2将完整的代码添加到github https://github.com/pacomet/git
You cannot change the datafile directly - it is a reactive source that cannot be changed except by a user input (in this case the choice of data file). 您无法直接更改数据文件-它是一个反应性源,只能通过用户输入(在这种情况下为数据文件的选择)才能更改。
You have 2 choices (that I know of): 您有2个选择(我知道):
1) Make a new object that holds the reformatted date: 1)制作一个包含重新格式化日期的新对象:
NewDate<-reactive({ as.POSIXct(paste(FECHA,H_SOLAR),
format = "%y/%m/%d %H:%M:%S")})
then use NewDate()
as your variable for graphing. 然后将
NewDate()
用作绘制图形的变量。
2) Change the date format within the function that makes the graph. 2)在制作图表的函数中更改日期格式。 eg
例如
plot(x~as.POSIXct(paste(FECHA,H_SOLAR),format="%y/%m/%d %H:%M:%S"),
data=datos())
Here is a somewhat similar issue: Formatting reactive data.frame 这是一个类似的问题: 格式化反应性data.frame
EDIT In response to the edited question - here is an updated answer. 编辑响应已编辑的问题-这是更新的答案。
I don't know much about ggplot
but if the issue is to get this all into one data.frame
, then you might want to do something like this: 我对
ggplot
不太了解,但是如果问题是将所有内容整合到一个data.frame
,那么您可能想要执行以下操作:
datos=reactive({read.csv(input$dataset,header=T,sep=";",na.strings="-99.900"))}
NewDate<-reactive <- ({as.POSIXct(paste(FECHA,H_SOLAR),
format = "%y/%m/%d %H:%M:%S" )})
datos2<-reactive({ data.frame(datos(),NewDate() })
Then try using datos2()
in ggplot
- I think that should give you what you need. 然后尝试在
ggplot
使用datos2()
-我认为这应该ggplot
您的需求。
I think this question can be closed thanks to the answer for @dieter-menne to another question about subsetting reactive data frames. 我想这个问题可以解决,这要归功于@ dieter-menne对另一个关于设置反应数据框架的问题的回答。 The point is to create a new local variable, similar to @john-paul suggestion.
关键是要创建一个新的局部变量,类似于@ john-paul建议。
Please take a look at https://stackoverflow.com/a/20569512/709777 请看看https://stackoverflow.com/a/20569512/709777
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