MATLAB Online Help Tips: How To Plot A Function

Not sure how to plot a function using Matlab? Get some insights from our Matlab homework help experts.

A function can be defined as a set of statements that are implemented together to perform a certain task. Functions work on variables that are available within their workspace. This workspace is also referred to as the local workspace. It is different from the workspace provided by Matlab that is accessed using a command prompt, commonly referred to as the base workspace.

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If you do not have the Matlab software installed on your computer, get the setup and install it.

The program files in Matlab do not store anonymous functions. You should understand what function you want to graph first. This is because Matlab requires the user to declare the independent variables the function has. Examples of anonymous functions include trigonometric, rational polynomials, and logarithmic.

The interval that your function is to be graphed on is to be entered before graphing your function. Intervals in Matlab usually have lower and upper bounds.

Your individual statements are entered here. You can assign values and functions to variables and plot functions inside the command window.

Typical function names are f and g. however, there is no restriction. You can name your function whatever you want. The only thing you should consider is that the name should start with a letter and not contain any special characters.

To do this, put an = sign after the name of the function. The next thing is to put space and the “@” sign, then open the parenthesis. After the “(“sign, you can start listing all the independent variables. Use a comma to separate the independent variables.

Type your function after setting up the independent variables. Some of the common types of functions in Matlab include:

Pressing enter saves the function to the variable. The function appears in the next line after you have pressed enter.

If you are plotting an anonymous function, use “fplot” even if your function is not named f.

fplot(function name, interval) – This is the proper syntax

The interval should be written as [lower bound upper bound]. Do not stress if you do not know the interval, just type “fplot(f)” and MATLAB will pick the interval for you. You should press enter again after typing this.

Ensure you do not exit out of the graph because you will not be able to add the graph if you do so. Just click back in the command window.

Hit enter each time after labeling axes or title. Here is how to assign a name to each:

• x-axis: xlabel(‘name’)

• y-axis: ylabel(‘name’)

• title:title(‘name’)

To save the graph, on the graph window, click on the file then press Save As and choose where you want to save it.

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