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Add One Column in an R Data Frame
Data Analysis projects might require things that we generally think simple but they are actually helpful to achieve objectives, one such thing would be adding values or columns of an R data frame. To add one column to rest of the next columns, we can replace the next columns by adding the one column by using single square brackets.
Consider the below data frame −
Example
x1<-rnorm(20) x2<-rnorm(20) x3<-rnorm(20) x4<-rnorm(20) df1<-data.frame(x1,x2,x3,x4) df1
Output
x1 x2 x3 x4 1 1.85664999 -0.9065488762 0.293178644 0.55457359 2 0.44698508 0.9893899854 0.536684098 0.28302308 3 0.61888012 -0.4300288618 1.030952802 -0.25713481 4 -0.05365888 1.1227376933 1.382627238 2.00689788 5 0.03964954 2.2557976594 -0.902402177 -1.58164559 6 -0.66872443 -0.0004653294 2.125212420 -1.10464733 7 0.03000691 -0.7238778598 -0.669792673 0.30548849 8 -0.43260468 0.4872185286 0.197004732 -1.84113665 9 -0.95276898 -1.0384948791 -0.007177681 -1.59672437 10 -0.83272853 0.5075483877 0.585314160 0.72559385 11 -0.23842261 0.2950442950 0.593196270 -0.11921104 12 -0.17180004 -0.0105962399 0.927656280 -1.07630231 13 0.26177947 -0.2539494068 0.333217120 0.62433826 14 0.42988050 -0.5740571129 -0.727895313 -0.58763643 15 0.47914315 -0.3317974395 -1.502326687 -0.12933857 16 0.72317202 0.4056645753 0.720629400 1.51496596 17 -0.63108679 1.1358016229 -0.467778438 0.40033389 18 -0.39403524 -1.3937678989 -1.579988055 1.61907436 19 0.38662052 -0.2191345379 0.409531230 -2.50333812 20 -0.34579323 0.2170208774 0.441002799 0.08652698
Adding column 1 to columns 2 to 4 in df1 −
Example
df1[2:ncol(df1)]<-df1[2:ncol(df1)]+df1[,1] df1
Output
x1 x2 x3 x4 1 1.85664999 0.950101112 2.14982863 2.4112236 2 0.44698508 1.436375070 0.98366918 0.7300082 3 0.61888012 0.188851261 1.64983293 0.3617453 4 -0.05365888 1.069078817 1.32896836 1.9532390 5 0.03964954 2.295447201 -0.86275264 -1.5419960 6 -0.66872443 -0.669189755 1.45648799 -1.7733718 7 0.03000691 -0.693870954 -0.63978577 0.3354954 8 -0.43260468 0.054613849 -0.23559995 -2.2737413 9 -0.95276898 -1.991263856 -0.95994666 -2.5494933 10 -0.83272853 -0.325180141 -0.24741437 -0.1071347 11 -0.23842261 0.056621690 0.35477366 -0.3576336 12 -0.17180004 -0.182396283 0.75585624 -1.2481024 13 0.26177947 0.007830061 0.59499659 0.8861177 14 0.42988050 -0.144176615 -0.29801481 -0.1577559 15 0.47914315 0.147345709 -1.02318354 0.3498046 16 0.72317202 1.128836595 1.44380142 2.2381380 17 -0.63108679 0.504714834 -1.09886523 -0.2307529 18 -0.39403524 -1.787803135 -1.97402329 1.2250391 19 0.38662052 0.167485982 0.79615175 -2.1167176 20 -0.34579323 -0.128772348 0.09520957 -0.2592662
Example
y1<-rpois(20,5) y2<-rpois(20,5) y3<-rpois(20,5) y4<-rpois(20,5) y5<-rpois(20,5) df2<-data.frame(y1,y2,y3,y4,y5) df2
Output
y1 y2 y3 y4 y5 1 11 5 3 2 9 2 7 4 6 11 3 3 2 4 3 5 5 4 3 4 3 8 5 5 7 5 6 6 3 6 3 4 5 6 8 7 4 6 5 7 4 8 6 4 6 5 3 9 6 2 4 8 8 10 7 8 3 3 4 11 2 10 01 2 5 12 7 7 2 6 1 13 8 5 6 3 2 14 5 5 4 9 4 15 5 5 6 5 7 16 6 4 8 9 4 17 3 3 5 9 0 18 5 4 3 5 2 19 5 6 9 11 4 20 4 4 3 4 10
Adding column 1 to columns 2 to 5 in df2 −
Example
df2[2:ncol(df2)]<-df2[2:ncol(df2)]+df2[,1] df2
Output
y1 y2 y3 y4 y5 1 11 16 14 13 20 2 7 11 13 18 10 3 2 6 5 7 7 4 3 7 6 11 8 5 7 12 13 13 10 6 3 7 8 9 11 7 4 10 9 11 8 8 6 10 12 11 9 9 6 8 10 14 14 10 7 15 10 10 11 11 2 12 3 4 7 12 7 14 9 13 8 13 8 13 14 11 10 14 5 10 9 14 9 15 5 10 11 10 12 16 6 10 14 15 10 17 3 6 8 12 3 18 5 9 8 10 7 19 5 11 14 16 9 20 4 8 7 8 14
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