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    <p>MATLAB's <strong>FOR</strong> loop is static in nature; you cannot modify the loop variable between iterations, unlike the <strong>for(initialization;condition;increment)</strong> loop structure in other languages. This means that the following code always prints 1, 2, 3, 4, 5 regardless of the value of B.</p> <pre><code>A = 1:5; for i = A A = B; disp(i); end </code></pre> <p>If you want to be able to respond to changes in the data structure during iterations, a <a href="https://www.mathworks.com/help/matlab/ref/while.html?s_tid=doc_ta" rel="noreferrer"><strong>WHILE</strong> loop</a> may be more appropriate --- you'll be able to test the loop condition at every iteration, and set the value of the loop variable(s) as you wish:</p> <pre><code>n = 10; f = n; while n &gt; 1 n = n-1; f = f*n; end disp(['n! = ' num2str(f)]) </code></pre> <p>Btw, the <strong>for-each</strong> loop <a href="http://java.sun.com/j2se/1.5.0/docs/guide/language/foreach.html" rel="noreferrer">in Java</a> (and possibly other languages) produces unspecified behavior when the data structure is modified during iteration. If you need to modify the data structure, you should use an appropriate <strong><a href="http://java.sun.com/javase/6/docs/api/java/util/Iterator.html" rel="noreferrer">Iterator</a></strong> instance which allows the addition and removal of elements in the collection you are iterating. The good news is that MATLAB supports Java objects, so you can do something like this:</p> <pre><code>A = java.util.ArrayList(); A.add(1); A.add(2); A.add(3); A.add(4); A.add(5); itr = A.listIterator(); while itr.hasNext() k = itr.next(); disp(k); % modify data structure while iterating itr.remove(); itr.add(k); end </code></pre>
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    1. POIs there a foreach in MATLAB? If so, how does it behave if the underlying data changes?
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    1. USZach Scrivena
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    1. POIs there a foreach in MATLAB? If so, how does it behave if the underlying data changes?
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    1. COIf B is undefined, your first example doesn't print 1-5. It prints `Undefined function or variable 'B'`.
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      1. USKleist
    2. COFor the 1st example make sure that `A` is a row vector, not column vector. If `A` is a matrix, each k will be a column vector from that matrix. So, transpose(`A'`) or vectorize (`A(:)'`) if needed.
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    3. CO-1 I do _not_ think Java-like code should be your first choice way to work with Matlab in `.m` files.
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