I am new to R and am trying to collapse rows based on row values with dplyr. The following example shows the sample data.
set.seed(123)
df<-data.frame(A=c(rep(1:4,4)),
B=runif(16,min=0,max=1),
C=rnorm(16, mean=1,sd=0.5))
A B c
1 1 0.36647435 0.7485365
2 2 0.51864614 0.8654337
3 3 0.04596929 0.9858012
4 4 0.15479619 1.1294208
5 1 0.76712372 1.2460700
6 2 0.17666676 0.7402996
7 3 0.89759874 1.2699954
8 4 0.90267735 0.7101804
9 1 0.91744223 0.3451281
10 2 0.25472599 0.8604743
11 3 0.10933985 0.8696796
12 4 0.71656017 1.2648846
13 1 0.21157810 1.3170205
14 2 0.14947268 1.2789700
15 3 0.92251060 1.5696901
16 4 0.30090579 1.7642853
I want to summarize/collapse two rows based on the condition that the rows in column A
with values 1 and 2 as one row (as mean of row 1 and 2) . Therefore the final result will have only 12 rows because the other 4 rows has been collapsed.
I tried to use the following dplyr
function but to little avail.
install.packages ("tidyverse") library (tidyverse)
df %>% summarize_each( fun(i){ for i %in% c(1,2)funs(mean) })
The expected output is something like:
A B C
1 1.5 0.4425602 0.8069851
3 3 0.04596929 0.9858012
4 4 0.15479619 1.1294208
5 1.5 0.4718952 0.9931848
7 3 0.89759874 1.2699954
8 4 0.90267735 0.7101804
9 1.5 0.5860841 0.6028012
11 3 0.10933985 0.8696796
12 4 0.71656017 1.2648846
13 1.5 0.1805254 1.297995
15 3 0.92251060 1.5696901
16 4 0.30090579 1.7642853
Thank you in advance.
set.seed()
call in your example. That way others can replicate your results exactly! – Mikko Marttila