Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
How to add a new value to each element of list in R?
Suppose we have a list that contain two elements and we get a new value for both of these elements then the problem of adding those values to the original list arises. This can be done with the help of mapply function. We can append the new values in the original easily but a vector of the new values needs to be created first.
Example1
List1<−list(x1=rnorm(50),x2=rnorm(50)) new<−list(0.34,0.37)
Adding new values to List1 −
Example
List1<−mapply(append,List1,new,SIMPLIFY=FALSE) List1
Output
$x1 [1] −0.21433819 0.34745333 −0.91392492 −1.18555411 −0.99932134 −0.57548735 [7] 1.10651668 0.48454439 −0.99232515 −0.99568362 0.23641052 2.67800406 [13] −0.75788305 1.19569169 −1.15838659 0.73623778 −0.17743427 1.30542832 [19] −1.76846085 −0.59177306 0.17272266 −0.63534109 −0.23215985 −1.67575615 [25] 0.59034063 2.52226746 0.40437735 −0.06360738 −0.53810661 −0.04455344 [31] 0.71511225 −0.35993230 1.29632787 0.13729957 −0.52563320 0.46982761 [37] 0.12234186 −1.23848802 1.29268576 −0.05836899 −0.66205174 −0.07619300 [43] −1.04585532 3.67861858 0.73080674 −1.36358925 −0.78699970 0.41224880 [49] 0.86365984 1.78372714 0.34000000 $x2 [1] −1.008028153 0.753706027 0.339136404 0.394850535 0.822800452 [6] 1.131092940 −0.044501179 −0.247914864 −0.350871896 0.013754292 [11] 0.002728324 0.776690869 −1.002677732 −1.236941825 0.599039509 [16] 0.532717545 0.262159708 −0.373315320 −1.609664791 −2.034626869 [21] 0.563657076 0.440259691 1.690137148 −0.937983631 −1.661222786 [26] 0.325805813 0.111868681 2.189960485 1.200441769 −0.178213068 [31] −0.628382611 −1.777857157 0.893458151 1.009731364 −0.657754484 [36] 0.788648791 −1.343786681 0.993323519 0.021705024 −0.719988792 [41] 0.458443258 −0.624894337 1.466201931 −0.320907500 −1.327935744 [46] 1.397215872 0.352245992 −0.278273447 0.864011297 −0.979787012 [51] 0.370000000
Example2
List2<−list(y1=rpois(99,10),y2=rpois(99,10)) new<−list(5,3)
Adding new values to List2 −
Example
List2<−mapply(append,List2,new,SIMPLIFY=FALSE) List2
Output
$y1 [1] 9 19 3 6 10 7 6 8 10 3 6 10 11 7 9 11 13 8 10 8 8 11 10 13 9 [26] 15 5 10 11 10 15 14 5 10 5 7 9 14 10 14 9 11 13 13 12 8 9 13 13 7 [51] 13 9 9 9 13 10 9 13 10 8 9 11 7 8 4 9 11 8 14 8 4 8 11 13 15 [76] 9 8 7 13 10 13 7 13 10 5 8 8 11 7 4 7 15 7 5 11 9 10 13 11 5 $y2 [1] 5 10 8 8 5 14 13 5 7 15 14 12 8 6 15 8 9 6 9 9 14 9 7 9 7 [26] 14 12 2 12 10 14 12 13 11 9 11 10 5 10 9 13 8 8 11 11 18 12 8 14 11 [51] 12 14 18 9 9 16 15 7 13 10 12 8 8 10 7 8 6 14 9 9 10 20 11 10 8 [76] 12 6 9 5 12 10 9 9 6 11 10 11 14 8 11 11 11 9 10 6 9 13 11 13 3
Example3
List3<−list(z1=runif(49,2,10),z2=runif(49,5,10)) new<−list(3.24542,7.21421)
Adding new values to List3 −
List3<−mapply(append,List3,new,SIMPLIFY=FALSE) List3
Output
$z1 [1] 7.291533 6.972070 3.586818 6.973179 5.138934 7.952336 3.354811 8.508972 [9] 9.436393 7.226165 4.316177 7.212349 2.944707 8.458374 5.844430 6.623924 [17] 8.705829 2.509108 9.074396 3.360153 9.034577 5.679748 9.096813 6.989252 [25] 3.814996 4.227093 8.546505 7.225875 3.246433 4.620028 7.876439 2.746531 [33] 4.588123 3.770730 7.954941 4.840489 5.309890 3.292286 6.110796 6.506668 [41] 9.662596 5.216663 8.697122 6.700522 3.520535 9.827375 8.321387 4.603970 [49] 5.582278 3.245420 $z2 [1] 7.360781 7.984698 9.110684 9.866965 7.821411 7.912576 8.132087 6.343781 [9] 8.635346 5.778531 9.980152 6.572830 5.289732 7.245998 6.681521 8.756547 [17] 9.282966 5.567102 7.823283 9.973521 7.758861 5.727483 9.618834 5.911291 [25] 7.229435 8.783410 7.815542 7.840888 8.514780 7.798654 7.415919 8.948754 [33] 7.046777 7.855829 6.973687 6.351384 9.041160 9.727344 7.731367 7.100542 [41] 6.987909 7.940805 9.893710 7.400530 9.528001 6.247381 8.108900 8.553423 [49] 9.856233 7.214210
Example4
List4<−list(a1=sample(0:9,49,replace=TRUE),a2=sample(0:9,49,replace=TRUE)) new<−list(5,2)
Adding new values to List4 −
List4<−mapply(append,List4,new,SIMPLIFY=FALSE) List4
Output
$a1 [1] 2 4 7 0 8 7 8 8 3 5 9 4 6 6 6 5 4 9 7 1 0 7 8 3 3 6 7 2 3 2 2 5 2 4 7 4 2 0 [39] 7 9 3 3 4 6 7 3 4 0 9 5 $a2 [1] 5 7 4 8 9 4 1 8 5 6 9 0 4 2 7 2 6 2 0 1 6 7 3 9 6 8 2 5 4 1 2 3 7 3 5 4 5 1 [39] 5 7 9 9 3 6 4 4 1 8 4 2
Updated on: 08-Feb-2021
616 Views
Advertisements