![]() ![]() ![]() It is such a large number that even if every pass through the loop only takes 1 millisecond getting through the loop will take about 10000 years. Explanation: 281474976710655 is the largest integer that MATLAB can represent internally. This means that if you write for i=1:281474976710655 you’ll get a loop that, on its own, will “never” terminate. Internally it simply iterates over the values in that vector by incrementing i until it reaches n. (Hint: when using the notation for i=1:n MATLAB does not actually create the vector 1:n. Recreate the functionality of a while loop using a for loop. The “input” of a while loop is the condition statement.Recreate the functionality of a for loop using a while loop. The “input” of a for loop is a variable and a vector of values.for loops and while loops are not inherently different: The resulting character array contains the M-file help for the fft. Rewrite the above code for the first 100 primes without using neither continue nor break. A break statement is used to exit the while loop when the first empty line is encountered. The keywords break and continue are not “needed’’ per se, but they can make the code more elegant and readable. Sprintf('%d is prime!\n',n) % this is quite an interesting command. % differently with an "if" statement, but this can be more elegant If mod(n,i)=0 % means that i divides n exactlyįlag = 1 % to know that we found a divisorīreak % no need to remain in the for loopĬontinue % to avoid the next line. While 1 % this means that unless we use "break", the loop will continue "forever"įor i=2:ceil(sqrt(n)) % no need to check numbers greater than the square-root of n Here’s example code for a while loop that uses both break and continue to find the first 100 primes (not very efficiently, but it’s only an example): n=1 It avoids the rest of the statements of the inner most loop, but continues in the loop (does not stop like break). The keyword continue is similar but different. If mod(s,2) % the actual "brains" of the iteration While s~=1 % as long as s is not equal to 1 stay in the loop Here is an example that computes the “trajectory” of 6 but stops if it finds a 17 in it: s=6 % initialize s to 6 It will only terminate one loop (in the case of nested loop, the innermost one it is in) and will normally be protected by an if statement (otherwise the loop is silly). The break keyword tells MATLAB® to exit the loop immediately. Similarly a for loop will run through all of its iterations. Fractals and Chaos Terminating a Loop Prematurely: Break and ContinueĪs you may recall, a while loop will evaluate all its statements without checking the condition.
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