This is not exactly something usefull because it requires to much “hand work” but it is good to know how it works:

By columns:

> data1col1<-c("Joe", "Jim", "Anna") 
> data1col2<-c("Plumber", "Kirk", "Queen") 
> data1col3<-c(35, 41, 26) 
> data1<-data.frame(data1col1, data1col2, data1col3)
> names(data1)<-c("First_name", "Last_name", "Age")
> data1
  First_name Last_name Age
1        Joe   Plumber  35
2        Jim      Kirk  41
3       Anna     Queen  26

By rows:

> row1<-c("Joe", "Plumber", "1980-01-01")
> dataset1<-rbind(row1)
> dataset1
     [,1]  [,2]      [,3]        
row1 "Joe" "Plumber" "1980-01-01"
> row2<-c("Annie", "Smith", "2001-02-15")
> dataset1<-rbind(dataset1, row2)
> dataset1
     [,1]    [,2]      [,3]        
row1 "Joe"   "Plumber" "1980-01-01"
row2 "Annie" "Smith"   "2001-02-15"