[R] help with grouping data and calculating the means

[Boris Steipe]

Use round() with the appropriate  "digits" argument. Then use unique() to define your groups.

HTH,
B.


> On 2018-11-15, at 11:48, sasa kosanic <sasa.kosanic using gmail.com> wrote:
> 
> Dear All,
> 
> I would very much appreciate the help with following:
> I need to calculate the mean of  different lat/long points that should be
> grouped.
> However I would like that r excludes taking  values that are different in
> only last decimal.
> So instead 4 values in the group it would calculate the mean for only 3(
> excluding the ones that differs in only one decimal).
> # construct the dataframe
> `TK-QUADRANT` <- c(9161,9162,9163,9164,10152,10154,10161,10163)
> LAT <- c(55.07496,55.07496,55.02495,55.02496
> ,54.97496,54.92495,54.97496,54.92496)
> LON <-
> c(8.37477,8.458109,8.37477,8.45811,8.291435,8.291437,8.374774,8.374774)
> df <- data.frame(`TK-QUADRANT`=`TK-QUADRANT`,LAT=LAT,LON=LON)
> 
> 
> I would like to group the data and calculate means by group but in a way to
> exclude every number that differs in only last decimal.
> 
> 
> Also please see pdf. example-attached .
> 
> Many thanks!
> Best wishes,
> Sasha
> 
> -- 
> 
> Dr Sasha Kosanic
> Ecology Lab (Biology Department)
> Room M644
> University of Konstanz
> Universitätsstraße 10
> D-78464 Konstanz
> Phone: +49 7531 883321 & +49 (0)175 9172503
> 
> http://cms.uni-konstanz.de/vkleunen/
> https://tinyurl.com/y8u5wyoj
> https://tinyurl.com/cgec6tu
> <dataset example.pdf>______________________________________________
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