Exercises

Hey class, today we will discuss how we can streamline our coding process using M-file scripts in MATLAB. Can anyone tell me why we might want to use a script instead of typing commands directly into the command window?

I think it's because we can save the commands and reuse them later.

That's correct! Using scripts allows us to write a set of commands in a file, save it, and execute it anytime using a single command. This is especially helpful when dealing with repetitive tasks.

What happens to the variables we create in a script?

Great question! All variables created in a script file are added to the workspace. However, be cautious because existing variables might get overwritten accidentally! Remember the acronym ROSE: 'Replace, Overwrite, Scope, Execute' to keep this in mind when using scripts.

To wrap up, M-file scripts are a powerful tool to automate tasks in MATLAB. They allow for code reuse and documentation of processes. We can write complex scripts and run them with ease.

Now, let's shift our focus to functions. What do you think makes functions different from scripts?

Functions can take inputs and give outputs, unlike scripts?

Exactly! Functions allow for reusable code that can accept variables as input and produce output based on computations done inside them. Can anyone recall the format of a function definition?

It starts with the keyword 'function', followed by the output variable, function name, and inputs in parentheses?

Well done! And remember, functions create their own workspace, which helps to avoid variable conflicts. To help you remember the function anatomy, you can use the mnemonic FANCY for: 'Function, Arguments, Name, Code, Yield'.

Now, let’s practice by writing a function to convert Fahrenheit to Celsius.

Let’s get into our exercises for today! First, we have a problem involving three characters buying fruits. How would you approach solving this problem?

We could set up a system of equations to find the price of each type of fruit?

Correct! Each character's purchases can be turned into equations based on the costs of apples, bananas, and cantaloupes. Once we define the equations, we can use MATLAB to solve for the costs.

What about the temperature conversion exercise?

For that one, you'll need to create a function that takes Fahrenheit as input and returns Celsius as output. Make sure to use the fprintf command to display the results attractively.

Lastly, for determining height and mass in SI units, remember to use both input and output arguments in your function. Who can explain the use of multiple outputs?

It allows us to return both height and mass values from the function!

Exactly right! Let’s work on these exercises together.