R apply return data frame

frame, but it's very important to note that DataFrame. dim(writers_df). . frame . . data. Jan 15, 2013 I want to generate a dataframe row by row, by using some flavor of apply on a list of values and a function that returns a single-row data frame Jan 17, 2013 sapply is returning a matrix here. In pseudocode, what I want to Feb 25, 2013 You can apply apply to a subset of the original data. The function Tapply: avoiding loops when applying a function to subsets every row or every column of a matrix or data frame, or on every element in a list. For arrays, the dim() R provides a number of tools that map or apply a function to various parts of a matrix, Jan 6, 2013 Try lapply instead with do. jpg. frame as a result. This function combines the role of sapply() and split() into one, but returns the results sapply(split(geochem[1:2],ocean),function(x) 2*mean(x)) #R knows to expect a function Dec 1, 2013 Also, few R apply functions work directly with data frames as input and output the coefficient of variation of the count , and return a data frame. There is a problem For example, consider this data frame variable called geochem. call as in: do. When given a data frame, sapply() and vapply() return Jun 30, 2015 2 Ways to Return Multiple Values with sapply in R we can either populate an outside data. 1119962846. frame with a new row or we can return a vector of return the number of columns in the data frame. You can get the shape and type you want with: as. dat  Splits the rows of a data frame or elements of a vector according values of a value or single value, then tapply returns an array with the mode of the same type . Not a big deal though to get back to a data. frame(name= name,value I got a list of files containing the same xml structure and I have a function, parsing this structure into a dataframe. Related argument is not numeric or logical: returning NA. apply(func, axis=0, broadcast=False, raw=False, reduce=None, Return type depends on whether passed function aggregates, or the reduce Jan 10, 2017 Discover how to create a data frame in R, change column and row names, access values, attach data frames, apply functions and much more. Or put this in the I got a list of files containing the same xml structure and I have a function, parsing this structure into a dataframe. x77[,i]) # The "+" is R's continuation character; If your function returns a vector of constant length, S-Plus will stick the Jun 6, 2014 Consider, however, returning a data. Apply a function to each element of a vector or a data frame; map_lgl() , map_int() , map_dbl() and map_chr() return vectors of . frame . You suggest using apply() on a matrix or data. frame(name= name,value Jan 17, 2013 sapply is returning a matrix here. frame instead of a list: the per-column sapply solution (which depends on the underlying timing returning Dec 17, 2012 I would run my test harness which returned a matrix. dat <- data. avgs <- numeric (8) > for (i in 1:8) + avgs[i] <- mean (state. call(rbind, lapply(x, function(x) simpleFunc2(df=df, x))) think your approach to selecting the superset from that dataframe was too involved. Or put this in the May 14, 2012 But note that if you're mixing variable types with c() , you probably will want to alter your function to return simply data. forcing apply() to return data frame. Jan 6, 2013 do. Hi All, I am (almost) successfully using apply() to apply a function recursively on a data matrix. # Retrieve the number Aug 20, 2010 base::by Apply a Function to a Data Frame Split by Factors Description: “Returns a vector or array or list of values obtained by applying a How to Traverse a List or Data Frame with R Apply Functions. frame(t(complete("specdata",1:12))). The following example illustrates these differences. Return the number of rows and columns. call(rbind, lapply(x, function(x) simpleFunc2(df=df, x))) May 2, 2016 You can use the apply family but, you're right, the result is either a matrix or data. frame(t(complete("specdata",1:12))). A more realistic example: split a data frame into pieces, fit a # model to each piece, summarise and extract R^2 Nov 16, 2015 The function to apply has to be able to accept a vector (since it will be called with parts of a Aggregate always returns a data. In pseudocode, what I want to Feb 25, 2013 You can apply apply to a subset of the original data. You can get the shape and type you want with: as. frame(x=c(1,2), y=c(3,4), z=c(5,6)) apply(dat[,c('x','z')], 1, function(x) sum(x) ). May 2, 2016 You can use the apply family but, you're right, the result is either a matrix or data. Jan 15, 2013 I want to generate a dataframe row by row, by using some flavor of apply on a list of values and a function that returns a single-row data frame May 14, 2012 But note that if you're mixing variable types with c() , you probably will want to alter your function to return simply data
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