[R] about data manipulation

[Berend Hasselman]

> 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.


> 	[[alternative HTML version deleted]]
> 

Plan text mail. Has been asked many, many times before.


Berend Hasselman


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