http://duoduokou.com/r/66088745648416960539.html WebNov 19, 2013 · Group-wise transformation compute the rank of a name within a sex and year (e.g. boy & 2008)? ... array dataFrame list array aaply adply alply dataFrame daply …
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WebJan 27, 2014 · Hadley's ggplot2 book has this example for ddply and subset but it's not actually sorting the output, just selecting the two smallest diamonds per group. ddply (diamonds, . (color), subset, order (carat) <= 2) plyr Share Improve this question Follow edited Mar 27, 2013 at 12:21 Matt Dowle 58.4k 22 165 224 asked Apr 30, 2011 at 3:24 … http://duoduokou.com/r/66087796750026568596.html
http://felixfan.github.io/plyr/ WebDescription Summarise works in an analogous way to mutate, except instead of adding columns to an existing data frame, it creates a new data frame. This is particularly useful in conjunction with ddplyas it makes it easy to perform group-wise summaries. Usage summarise(.data, ...) Arguments .data the data frame to be summarised
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WebNov 7, 2013 · ddply is the workhorse, the split and the function to compute the growth rate is defined by parameters to this function. Share Improve this answer Follow answered Nov 6, 2013 at 23:04 krlmlr 24.6k 14 117 209 1 you beat me by 12 seconds. I like my geometric-mean ( diff (log (x))) approach, but yours works too. – Ben Bolker Nov 6, 2013 at 23:05
WebOct 24, 2013 · ddply (mtcars,. (cyl),transform,freq=length (cyl),sum=sum (mpg)) DT [,list (freq=.N,sum=sum (mpg)),by=cyl] But, data.table gives me only three columns cyl,freq, and sum. Well, I can do like this: DT [,list (freq=.N,sum=sum (mpg),mpg,disp,hp,drat,wt,qsec,vs,am,gear,carb),by=cyl] restaurant crying tiger parisWebSep 28, 2011 · This weighting factor has to be derived for each combination of site and date. The approach I'm using is to first built a function that calculate the weigthing factor: > weight <- function (dil) { dil/sum (dil) } then apply the function for each combination of site and date > df$wt <- ddply (df,. (date,site),.fun=weight) prove that sin2x+2sin4x+sin6x 4 cos 2x sin 4xWebI am trying to use ddply with transform to populate a new variable (summary_Date) in a dataframe with variables ID and Date.The value of the variable is chosen based on the length of the piece that is being evaluated using ifelse: . If there are less than five observations for an ID in a given month, I want to have summary_Date be calculated by … restaurant curry base sauceWebddply function - RDocumentation (version 1.8.8 ddply: Split data frame, apply function, and return results in a data frame. Description For each subset of a data frame, apply function then combine results into a data frame. To apply a function for each row, use adply with .margins set to 1. Usage restaurant cutting board replacementWebDec 12, 2014 · df.ddply = ddply (df, c ('name'), transform, counter=length (df [df ['var']>0, 'var'])) The reason why I would like to use the length function here is because the values for the var column can be from 0-9. This is the output from the above line: name counter 1 alan 6 2 albert 6 3 alvin 6 Am I missing something here? restaurant customer survey formWebMay 2, 2024 · If njobs = 1, a call to plyr::ddply is made without parallelization, and anything supplied to .paropts is ignored. See the documentation for plyr::ddply for additional details. Value The object data frame returned by plyr::ddply See Also plyr::ddply Examples Smisc documentation built on May 2, 2024, 2:46 a.m. restaurant cup washing machineWebddply is the most commonly used format. As the first 2 letters indicate, ddply takes an existing dataframe, splits it apart, extracts some information from it, and either makes a … prove that sin cos 1 1 sin cos 1 sec tan