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1.14: Chapter Exercises

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Exercise 1: Exploring Data Types

In the Command Window, define the following variables:

myInt = 20;
myRealNum = 20.2;
myCharArray = 'hello';
myString = "hello";
myLogical = true;
myStringNum = "2023";

a) Use whos to learn about each variable's data type and memory use.

b) Convert myInt to a true integer type.

c) Convert myStringNum to a number.

d) Explain the difference between myCharArray and myString.

Exercise 2: Help Tools

a) Use lookfor to learn how to calculate a base-10 logarithm.

b) Use lookfor or doc to learn how to create a random integer.

c) Use help to learn about the sqrt function.

d) Write down one difference between help and doc.

Exercise 3: Numeric Expressions

Define u = 1 and v = 3. Predict the results of the following expressions before typing them in MATLAB:

25 / (4 * 4)
(12 + 5) / 3
(13 + 3) / (7 * 10)
v / u
3^4
4^2 / 3
pi * v

Exercise 4: Meal Cost

A drink costs $2 and a taco costs $3. Write MATLAB code that assigns totalCost with the total meal cost for any number of drinks and tacos. Test your code using 4 drinks and 6 tacos.

Exercise 5: Wind Chill Factor

Create variables T and V for temperature in degrees Fahrenheit and wind speed in miles per hour. Use the wind chill formula from this chapter to calculate WCF. Then change T and V and recalculate.

Exercise 6: Logical Expressions

Define the following variables:

cold = true;
night = false;
raining = true;

Evaluate the following expressions and explain each result in words:

cold & night
cold | night
cold & raining
~raining
xor(night, raining)
(cold | night) & raining

Exercise 7: Variable Name Practice

For each name below, decide whether it is a valid MATLAB variable name. If it is not valid, rewrite it as a valid name.

Proposed name	Valid? If not, fix it.
1stValue
firstValue
speed limit
speed_limit
for
studentGrade
total-cost
totalCost

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