Introduction to xlabel Matlab
MATLAB, as we know, is a great tool for visualization. It provides us with ability to create a wide variety of plots. In this article we will focus on how to label x axis according to our requirement. In MATLAB, xlabels function is used to set a custom label for x axis.
Let us start by taking the example of a bar plot depicting salaries of employees.
Syntax
Let A be an array containing salaries of 6 employees Jim, Pam, Toby, Mike, Sam, Steve; in the same order.
- A = [ 20000, 25000, 30000, 42000, 70000, 35000 ][Defining an array of salaries]
Now we will plot a bar graph for the data above. We will pass our names as categorical array:
- B = categorical ({‘Jim’, ‘Pam’, ‘Toby’, ’ Mike’, ‘Sam’, ‘Steve’ })[Defining an array of employee names]
- B = reordercats(B, {‘Jim’, ‘Pam’, ‘Toby’, ‘Mike’, ‘Sam’, ‘Steve’})[Calling ‘reordercats’ to preserve the order]
- bar (B, A) [Creating the bar pot]
Now, we will name our x-axis as “Employee Salary”. For doing so, we will be using ‘xlabel’ function.
- xlabel({‘Employee Salary’})[Setting the name of x-axis]
This is how our input and output will look like in MATLAB console:
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Code:
A = [ 20000, 25000, 30000, 42000, 70000, 35000 ]
B = categorical ({'Jim', 'Pam', 'Toby', 'Mike', 'Sam', 'Steve' })
B = reordercats(B, {'Jim', 'Pam', 'Toby', 'Mike', 'Sam', 'Steve'})
bar (B, A)
xlabel({'Employee Salary'})
Output:
As we can see, we have named our x axis as ‘Employee Salary’.
How to get the x-axis label in the color of our choice?
In the above output, MATLAB has created x-axis label in black color. Now what if we want it to be in some other color? For our understanding, we will create x-label in green color.
Syntax
- A = [ 20000, 25000, 30000, 42000, 70000, 35000 ][Defining an array of salaries]
Now we will plot a bar graph for the data above. We will pass our names as categorical array:
- B = categorical ({‘Jim’, ‘Pam’, ‘Toby’, ’ Mike’, ‘Sam’, ‘Steve’ })[Defining an array of employee names]
- B = reordercats(B, {‘Jim, ‘Pam, ‘Toby, Mike, ‘Sam’, ‘Steve’})[Calling ‘reordercats’ to preserve the order]
- bar (B, A) [Creating the bar pot]
Now, we will set the color of label for our x-axis as green. For doing so, we will be passing ‘g’in argument.
- xlabel(‘Employee Salary’, ‘color’, ‘g’)[Setting the name and color]
This is how our input and output will look like in MATLAB console:
Code:
A = [ 20000, 25000, 30000, 42000, 70000, 35000 ]
B = categorical ({'Jim', 'Pam', 'Toby', 'Mike', 'Sam', 'Steve' })
B = reordercats(B, {'Jim', 'Pam', 'Toby', 'Mike', 'Sam', 'Steve'})
bar (B, A)
xlabel('Employee Salary', 'color', 'g')
Output:
How to add value from a variable to our xlabel?
For this example, we will see data of half-yearly sales:
Syntax
- a = [10.1, 12.1, 14.1, 16.1, 18.1, 20.1][Defining the array with sales in millions ]
- b = categorical({‘Jan’, ‘Feb’, ‘March’, ‘April’, ‘May’, ‘June’})[Respective months]
- bar(b, a)
- year = 2019[Declaring the variable from which we will extract the value]
- xlabel([‘Sales in millions for half year’,num2str(year)])
This is how our input and output will look like in MATLAB console:
Code:
a = [10.1, 12.1, 14.1, 16.1, 18.1, 20.1]
b = categorical({'Jan', 'Feb', 'March', 'April', 'May', 'June'})
bar(b, a)
year = 2019
xlabel(['Sales in millions for half year',num2str(year)])
Output:
As we can clearly see n the output, we have obtained the value of the year from our variable.
In the above example we can also create a multiline label; i.e we can have the label ‘Sales in millions for half year’ in one line and ‘2019’ in another line. Let us see how to do it.
Syntax
- a = [10.1, 12.1, 14.1, 16.1, 18.1, 20.1][Defining the array with sales in millions ]
- b = categorical({‘Jan’, ‘Feb’, ‘March’, ‘April’, ‘May’, ‘June’})[Respective months]
- bar(b, a)
- xlabel({‘Sales in millions for half year’, ‘(2019)’})
This is how our input and output will look like in MATLAB console:
Code:
a = [10.1, 12.1, 14.1, 16.1, 18.1, 20.1]
b = categorical({'Jan', 'Feb', 'March', 'April', 'May', 'June'})
bar(b, a)
xlabel({'Sales in millions for half year','(2019)'})
Output:
We can see in our output that there are 2 rows of labels now as expected.
Conclusion – xlabel Matlab
MATLAB can be used to plot our data for visualizing and intuitively understanding it. There could be instances when we have to provide a label to our x-axis. In such cases, we make use of the function ‘xlabel’.
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