R plus equals and plus plus equivalent from c c java etc

Question

Does R have a concept of     plus equals  or     plus plus  as c   c  others do

User · Accepted Answer

No  it doesn t  see  R Language Definition  Operators

User · Answer

Following  GregaKe  pret you can make an infix operator            function e1 e2  eval parent substitute e1  lt - e1   e2   x   1 x      2   x

User · Answer

We released a package  roperators  to help with this kind of thing  You can read more about it here  https   happylittlescripts blogspot com 2018 09 make-your-r-code-nicer-with-roperators html   install packages  roperators   require roperators   x  lt - 1 3 x      1  x x  -   3  x y  lt - c  a    b    c   y       text   y y  -    text   y    etc

User · Answer

R doesn t have these operations because  most  objects in R are immutable   They do not change   Typically  when it looks like you re modifying an object  you re actually modifying a copy

User · Answer

Increment and decrement by 10   require Hmisc  inc x   lt - 10   dec x   lt - 10

User · Answer

R doesn t have a concept of increment operator  as for example    in C   However  it is not difficult to implement one yourself  for example   inc  lt - function x     eval parent substitute x  lt - x   1       In that case you would call  x  lt - 10 inc x    However  it introduces function call overhead  so it s slower than typing x  lt - x   1 yourself  If I m not mistaken increment operator was introduced to make job for compiler easier  as it could convert the code to those machine language instructions directly

User · Answer

We can override    If unary   is used and its argument is itself an unary   call  then increment the relevant variable in the calling environment       lt - function e1 e2         if unary      keep original behavior     if missing e2           s e1  lt - substitute e1          if e1  the argument of unary    is itself an unary     operation       if length s e1     2  amp  amp            identical s e1  1    quote        amp  amp            length s e1  2       1              increment value in parent environment         eval parent substitute e1  lt - e1   1  list e1   s e1  2              else unary     should just return it s input         else e1       if binary      keep original behavior       else  Primitive  quot   quot   e1  e2     x  lt - 10   x x    1  11  other operations don t change   x   2    1  13 x    2    1  13  x    1  11 x    1  11  Don t do it though  as you ll slow down everything  Or do it in another environment and make sure you don t have big loops on these instructions  You can also just do this         lt - function x  eval parent substitute x  lt - x   1   a  lt - 1      a  a    1  2

User · Answer

We can also use inplace library inplace  x  lt - 1 x    lt -  2

[r] R: += (plus equals) and ++ (plus plus) equivalent from c++/c#/java, etc.?

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