Question

I. Examine the following for loops and determine how many times each loop will be executed. Show your solutions. Box your final answer.


1. for index = 7:10

2. for jj = 7:-1:10

3. for index = 1:10:10

4. for ii = -10:3:-7

5. for kk = [0 5 ; 3 3]

Answer 1

1. for index = 7:10

With such syntax the variable index goes from 7 to 10 (including) with step 1. So loop will be executed 10-7 +1= 4 times.

Answer. 4.

2. for jj = 7:-1:10

Will not be execupted at all, becourse this syntax (a:-1:b) assumes going back from a to b. And as far as 7<10, it is not possible

Answer. 0

3. for index = 1:10:10

With such syntax the variable index goes from 1 to 10 (including) with step 10. So loop will be executed 1 time.

Answer. 1.

4. for ii = -10:3:-7

With such syntax the variable ii goes from -10 to -7 (including) with step 3. So loop will be executed 2 tims.

Answer. 2.

5. for kk = [0 5 ; 2 3]

With such syntax the variable kk takes value of each column in a matrix. As far as the matrix [0 5 ; 2 3] has 2 columns, the loop will be executed 2 times.

Answer. 2.