[R] Error when using median as aggregation function in dcast

[arun]

Hi,
Please check this link:
http://stackoverflow.com/questions/4835202/error-with-custom-aggregate-function-for-a-cast-call-in-r-reshape2
A.K.




----- Original Message -----
From: Johannes Radinger <johannesradinger at gmail.com>
To: R help <r-help at r-project.org>
Cc: 
Sent: Wednesday, June 26, 2013 4:36 AM
Subject: [R] Error when using median as aggregation function in dcast

Hi,


I am trying to calculated various summary statistics using the dcast
function
of reshape2. This works perfectly for getting the mean, sum, length, sd. But
when I want to calculate the median I get an error. I tried it with and
without removing
NAs:

my_median <- function(x) median(x, na.rm = FALSE)
median_df <- dcast(patch_stats_dfm,formula=species~input+barriers,my_median)

Error in vapply(indices, fun, .default) : values must be type 'integer',
but FUN(X[[1]]) result is type 'double'

What does this error mean and what is causing the error, resp. how can I
solve the problem and
get a median?

/Johannes

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