# MATLAB - The Nested Loops

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MATLAB allows to use one loop inside another loop. Following section shows few examples to illustrate the concept.

## Syntax:

The syntax for a nested for loop statement in MATLAB is as follows:

for m = 1:j for n = 1:k <statements>; end end

The syntax for a nested while loop statement in MATLAB is as follows:

while <expression1> while <expression2> <statements> end end

## Example

Let us use a nested for loop to display all the prime numbers from 1 to 100. Create a script file and type the following code:

for i=2:100 for j=2:100 if(~mod(i,j)) break; % if factor found, not prime end end if(j > (i/j)) fprintf('%d is prime\n', i); end end

When you run the file, it displays the following result:

2 is prime 3 is prime 5 is prime 7 is prime 11 is prime 13 is prime 17 is prime 19 is prime 23 is prime 29 is prime 31 is prime 37 is prime 41 is prime 43 is prime 47 is prime 53 is prime 59 is prime 61 is prime 67 is prime 71 is prime 73 is prime 79 is prime 83 is prime 89 is prime 97 is prime