[R] about data manipulation
drjimlemon at gmail.com
Thu Dec 1 07:41:12 CET 2016
If you want to use aggregate, supply the name of the function:
aggregate(flow~year, data=df, "sum")
You can also use "by" like this
I assume that you don't have to worry about missing months in a year.
On Thu, Dec 1, 2016 at 3:06 PM, lily li <chocold12 at gmail.com> wrote:
> Hi R users,
> I'm trying to manipulate dataset, but met some difficulties.
> year month flow
> 2006 3 3.5
> 2006 4 3.8
> 2006 5 21
> 2006 6 32
> 2007 3 4.1
> 2007 4 4.4
> I want to calculate total flow for each year, and use the code below:
> aggregate(flow~year, data=df, sum)
> But it gave the error message:
> Error in get(as.character(FUN), mode = "function", envir = envir) :
> object 'FUN' of mode 'function' was not found
> What is the problem and how to solve it? Thanks for your help.
> [[alternative HTML version deleted]]
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