CODEWITHSUNDEEP
matlab
user1943029
user1943029

Reputation: 79

How to repeat without using "for" or "while" or "repeat" functions?

Is there a function that can repeat a segment of code for a given number of times?

for example:

t= 0; 
while (t< 10) 
  if x==2 
    x=1 
  else 
    x=3; 
  end 
end

How can i rewrite this function using another function ?

Upvotes: 0

Views: 4959

Answers (3)

Dennis Jaheruddin
Dennis Jaheruddin

Reputation: 21563

Matlab automatically 'repeats' the code for you if you put it in a vector format:

x_vector = round(2*rand(10,1)) %Your x input
idx = (x_vector==2)
x_vector(idx) = 1;
x_vector(~idx) = 3;

Upvotes: 1

Acorbe
Acorbe

Reputation: 8391

Or, if the code executed in one iteration is independent on the results of other iterations, you can use arrayfun or cellfun.

For instance

 fun = @(x) disp(['hello ' , num2str(x)]);
 arrayfun(fun,1:5);

returns

 hello 1
 hello 2
 hello 3
 hello 4
 hello 5

Personally I do like these constructs because I find them very expressive just as std::for_each in C++.

Nonetheless, they have proven to be slower than their naive-loop counterparts which get JITed away by Matlab (there are several Q/A about this issue here on SO).

Upvotes: 2

Floris Velleman
Floris Velleman

Reputation: 4888

A recursive function can do this for you (assuming you can't use: for,while,repeat).

http://www.matrixlab-examples.com/recursion.html

Upvotes: 4

Related Questions