An interactive introduction to MATLAB

5.1for loops 59

The for loop

(http://www.eng.ed.ac.uk/teaching/courses/matlab/unit05/for-loop.shtml)

Self Test Exercise: for loops

Evaluate the following expressions without usingMATLAB. Check your an-

swers withMATLAB.

1. How many times will this code printHello World?
   1 for a=0:50
   2 disp('Hello World')
   3 end


2. How many times will this code printGuten Tag Welt?
   1 for a=−1:−1:− 50
   2 disp('Guten Tag Welt')
   3 end


3. How many times will this code printBonjour Monde?
   1 for a=−1:1:50
   2 disp('Bonjour Monde')
   3 end


4. How many times will this code printHola Mundo?
   1 for a=10:10:50
   2 for b=0:0.1:1
   3 disp('Hola Mundo')
   4 end
   5 end

Listing 5.3 demonstrates an example of using aforloop to take the sum of

a geometric series (the same example posed in Exercise 2, Question 8).

Listing 5.3: for_loop_sum.m - Script to sum a geometric series using aforloop

1 % for_loop_sum.m

2 % Script to sum a geometric series using a for loop

3 %

4 % Craig Warren, 01/09/2011

6 % Variable dictionary
7 % n Number of terms to sum
8 % my_sum Sum of geometric series
9 % r Constant (set to 0.5 for this example)
10 % m Loop counter

12 clear all; % Clear all variables from workspace
13 clc; % Clear command window