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recursion    
递归,循环

递归,循环

recursion
递回

recursion
n 1: (mathematics) an expression such that each term is
generated by repeating a particular mathematical operation

Recursion \Re*cur"sion\ (-sh?n), n. [L. recursio. See {Recur}.]
The act of recurring; return. [Obs.] --Boyle.
[1913 Webster]

When a {function} (or {procedure})
calls itself. Such a function is called "recursive". If the
call is via one or more other functions then this group of
functions are called "mutually recursive".

If a function will always call itself, however it is called,
then it will never terminate. Usually however, it first
performs some test on its arguments to check for a "base case"
- a condition under which it can return a value without
calling itself.

The {canonical} example of a recursive function is
{factorial}:

factorial 0 = 1
factorial n = n * factorial (n-1)

{Functional programming languages} rely heavily on recursion,
using it where a {procedural language} would use {iteration}.

See also {recursion}, {recursive definition}, {tail recursion}.

[{Jargon File}]

(1996-05-11)


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  • What is recursion and when should I use it? - Stack Overflow
    Recursion is a tree, with branches and leaves, called parents and children respectively When you use a recursion algorithm, you more or less consciously are building a tree from the data
  • Recursion vs loops - Stack Overflow
    Recursion is used to express an algorithm that is naturally recursive in a form that is more easily understandable A "naturally recursive" algorithm is one where the answer is built from the answers to smaller sub-problems which are in turn built from the answers to yet smaller sub-problems, etc
  • algorithm - recursion versus iteration - Stack Overflow
    Is it correct to say that everywhere recursion is used a for loop could be used? And if recursion is usually slower what is the technical reason for ever using it over for loop iteration? And if i
  • Understanding how recursive functions work - Stack Overflow
    Recursion could be implemented by continuation passing style, in which case there is no stack at all The stack is just one -- particularly efficient, and therefore in common usage -- reification of the notion of continuation
  • python - How to solve GRAPH_RECURSION_LIMIT error in langgraph and . . .
    2 You’re hitting GRAPH_RECURSION_LIMIT because your graph keeps looping on the same node without waiting for user input Solution: Use interrupt() in the node where you ask for input to pause execution, then resume the graph with Command(resume=<user_input>) This stops the infinite loop and lets the graph continue step by step Example:
  • Real-world examples of recursion - Stack Overflow
    There is no recursion in the real-world Recursion is a mathematical abstraction You can model lots of things using recursion In that sense, Fibonacci is absolutely real-world, as there are quite some real-world problems that can be modeled this way If you think that Fibonacci is not real-world, than I would claim that all other examples are abstractions as well, not real-world examples
  • c++ - How Recursion Works Inside a For Loop - Stack Overflow
    20 For recursion, it's helpful to picture the call stack structure in your mind If a recursion sits inside a loop, the structure resembles (almost) a N-ary tree The loop controls horizontally how many branches at generated while the recursion decides the height of the tree
  • What are the advantages and disadvantages of recursion?
    With respect to using recursion over non-recursive methods in sorting algorithms or, for that matter, any algorithm what are its pros and cons?





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