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Homework 5 cell arrays, classes, chars
ECE-210B Homework 5
In this homework, we will go through a few advanced data structures in MATLAB, such as cell
arrays, classes, chars, as well as dataset importing in MATLAB. You will be importing in the
fisheriris dataset and encapsulating it in classes. After obtaining all the data, you will be required
to write some methods for the class you just created. Also note that some operations will require
you to do some research, but not too much!
1. Load in the fisheriris dataset with the command load fisheriris. You should obtain a 150x4
matrix called meas, as well as a 150x1 cell array called species in your workspace. This is a
very popular dataset, and you can quickly google fisheriris to see what the columns of meas
represent.
• Create a class called Flower in its own .m file. In your Flower class, you should have the
following properties – petalWidth (double), petalLength(double), sepalWidth (double),
sepalLength (double) and species (char). The ith species corresponds to the ith row of
information in meas. Note that you do not need to specify the data type of the properties
when you are declaring a class the following properties are just here to impress on you
what type of properties you would be expecting.
• Create a constructor for your class. It should take in 4 doubles and a char array corresponding, in order, to the five properties of your class.
• Now, import the entries from meas and species into MATLAB and store them in a 150x1
cell array of Flower instances. You can either use a for loop to import the entries, or
use a more elegant way to make all entries in one line (this would require some research
on object formation in MATLAB). Either way is ok. However, note that the name of
the species are stored as cell arrays; make sure to extract from the cell as a char and
remove trailing white spaces before storing them in the Flower instances. There is
a single function that will do this, which you should be able to find with a quick google
search.
• Create a method called getSWidth for the Flower class, which will return the sepal length
of the object. Use this on the 30th Flower in your cell array, and check (using ==) that
this is the correct value by looking that the corresponding entry in meas.
• Create another method called report for the Flower object, which will print out a statement on the command window and report the details about the Flower object. This
function does not need to return anything. It should print out a statement of the following form if the flower is 5.1 cm in sepal length, 3.5 cm in sepal width, 1.4 cm in petal
length and 0.2 cm in petalWidth, and the species is setosa, for example: “The length
and width of its sepal are 5.1 cm and 3.5cm respectively, while the length and width of
its petal are 1.4cm and 0.2cm respectively. It belongs to the setosa species.”
1
In this homework, we will go through a few advanced data structures in MATLAB, such as cell
arrays, classes, chars, as well as dataset importing in MATLAB. You will be importing in the
fisheriris dataset and encapsulating it in classes. After obtaining all the data, you will be required
to write some methods for the class you just created. Also note that some operations will require
you to do some research, but not too much!
1. Load in the fisheriris dataset with the command load fisheriris. You should obtain a 150x4
matrix called meas, as well as a 150x1 cell array called species in your workspace. This is a
very popular dataset, and you can quickly google fisheriris to see what the columns of meas
represent.
• Create a class called Flower in its own .m file. In your Flower class, you should have the
following properties – petalWidth (double), petalLength(double), sepalWidth (double),
sepalLength (double) and species (char). The ith species corresponds to the ith row of
information in meas. Note that you do not need to specify the data type of the properties
when you are declaring a class the following properties are just here to impress on you
what type of properties you would be expecting.
• Create a constructor for your class. It should take in 4 doubles and a char array corresponding, in order, to the five properties of your class.
• Now, import the entries from meas and species into MATLAB and store them in a 150x1
cell array of Flower instances. You can either use a for loop to import the entries, or
use a more elegant way to make all entries in one line (this would require some research
on object formation in MATLAB). Either way is ok. However, note that the name of
the species are stored as cell arrays; make sure to extract from the cell as a char and
remove trailing white spaces before storing them in the Flower instances. There is
a single function that will do this, which you should be able to find with a quick google
search.
• Create a method called getSWidth for the Flower class, which will return the sepal length
of the object. Use this on the 30th Flower in your cell array, and check (using ==) that
this is the correct value by looking that the corresponding entry in meas.
• Create another method called report for the Flower object, which will print out a statement on the command window and report the details about the Flower object. This
function does not need to return anything. It should print out a statement of the following form if the flower is 5.1 cm in sepal length, 3.5 cm in sepal width, 1.4 cm in petal
length and 0.2 cm in petalWidth, and the species is setosa, for example: “The length
and width of its sepal are 5.1 cm and 3.5cm respectively, while the length and width of
its petal are 1.4cm and 0.2cm respectively. It belongs to the setosa species.”
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