Answer to Question #101062 in MatLAB for Meni

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.