Operation for element in dataframe

General
#1

Hi, community.

I meet an basic but interesting question when practicing R. How could we do the same operation on each element of the data frame, for example every element + 1? I know c5+1 or sapply function work. Is there any way?

What's more, how could we do different operation for element in different column or row? For example, first column(or row)+1, others not change. Or the element in odd number column(or row)+1, others-10.

Any help would be appreciated.

 c1<-c(16.6,1.0,10.1,NA,8.0,17.0,2.4,7.6,5.7,11.6,3.6,2.8,6.3,1.5,2.7,16.7,6.7,5.3,12.5)
 c2<-c(13.0,11.2,11.0,15.0,10.0,11.5,NA,7.8,9.2,6.6,1.6,8.2,18.0,18.9,7,9,2.9,16.1,17.8)
 c3<-c(4.2,5.6,1.4,3.4,5.0,5.8,5.1,8.2,8.8,9.1,1.9,7.7,9.1,10.6,3.7,9.9,10.2,11.5,5)
 c4<-c(9,8,1.4,0.2,5.0,5.8,3,8.2,1.2,9.1,1.9,25,9.1,3.6,3.7,11,10.2,33,5)
 c5<-data.frame(c1,c2,c3,c4)
 colnames(c5)<-c("col1","col2","col3","col4")
#2

Maybe something like this for the alternating row issue?

xx  <- seq(1, 19, by = 2)
c5[xx, 1 ]  <- c5[xx, 1] + 1
1 Like
#3

@jrkrideau
Thank you for your help.
Would you mind to show your opinion more specifically according to original post question?

#4

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