about data manipulation
On 1 Dec 2016, at 05:06, lily li <chocold12 at gmail.com> wrote: Hi R users, I'm trying to manipulate dataset, but met some difficulties. df 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.
Not enough information. If I try this df <- read.table(text="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 ", header=TRUE) df aggregate(flow~year, data=df, sum) I get a correct answer. So you are likely doing something weird and not showing us all.
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Plan text mail. Has been asked many, many times before. Berend Hasselman
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