matlab introduction code

ITP 168 – Introduction to MATLAB Spring 2016

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Homework 6: Shapes

Setup Given what we know about structures, we will write a script file that will ask the user if they wish to

create 3 shapes: circle, right triangle, and square. Each of these shapes will be a structure. Each of those

structures will be nested WITHIN a general structure: shape. The hierarchy looks like this:

 Shape Structure

o Attribute: Circle Structure

 Attribute: Radius

 Attribute: Center (2-element vector)

 Attribute: Area

o Attribute: Right Triangle Structure

 Attribute: Side Lengths (2-element vector) (you cannot arbitrarily prescribe all 3

side lengths)

 Attribute: Center (2-element vector)

 Attribute: Area

o Attribute: Square Structure

 Attribute: Side Length

 Attribute: Center (2-element vector)

 Attribute: Area

Part 1: Creating Shapes The script will ask the user, in succession, if they would like to create a circle, right triangle, or square. If

the user responds with a ‘y’, create the structure they desire within the shape structure and assign

random values to all attributes EXCEPT the area. You must calculate the area yourself. You must use a

string variable for the user input.

Use randi() to assign random values to the attributes. You can specify your own maximum value for the

randi() function.

Part 2: How many shapes? Check to see if the user has created any shapes. If they have not created any shapes, inform them that

they have no shapes, and therefore cannot continue on with the calculations and end the program. If

they only created one shape, inform them that they have only created one shape, and tell them which

shape they created and end the program.

If they have created more than one shape, move on to Part 3.

ITP 168 – Introduction to MATLAB Spring 2016

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Part 3: Distance Calculation Now that we know the user has created at least 2 shapes, print out the list of shapes to the user. (Hint:

print out the list of fieldnames, because you will be required to use dynamic field names).

Ask the user to choose a shape, and be sure to inform them they must type it exactly as you have

displayed it. Store this user input as a string variable. Check to see if the user input matches any of the

fieldnames of the shape structure. If it does not match any of the fieldnames of the shape structure,

inform the user they must type in their choice again.

Repeat this process again for the second shape (Note: user can enter the same shape twice, that’s

okay!)

Once you have the two shape names stored as strings, use dynamic field names to calculate the distance

between their centers. For a shape with center [X1 Y1] and another shape with center [X2 Y2], the

distance between the centers is:

𝐷𝑖𝑠𝑡𝑎𝑛𝑐𝑒 = √(𝑋2 − 𝑋1)2 + (𝑌2 − 𝑌1)22

Print out the distance. Format with 3 digits after the decimal.

Part 4: Area Ratio Follow the same process as in Part 3 to ask the user for two valid shapes.

Once you have the two valid shapes, calculate the ratio of the area of shape 1 to shape 2. For example if

the user chooses the square and the circle, calculate the ratio of the areas of the square to the circle.

Print out the ratio. Format with 3 digits after the decimal.

Sample Output Below is the sample output. Note that the script is run several times in succession. User input is

highlighted in red:

>> A5

Would you like to create a circle? (Y/N): y

Would you like to make a triangle? (Y/N): y

Would you like to make a square? (Y/N): y

You created these shapes:

circle

triangle

square

Choose two shapes to calculate the distance between centers.

You must spell them EXACTLY as they were written

ITP 168 – Introduction to MATLAB Spring 2016

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First shape: circle

Second shape: Triangle

No shape by that name!

Second shape: triangle

The distance between the circle and the triangle is 9.434

Choose two shapes to calculate the ratio of the areas.

You must spell them EXACTLY as they were written

First shape: circle

Second shape: circle

The ratio of the areas (circle:circle) is 1.000

>> A5

Would you like to create a circle? (Y/N): n

Would you like to make a triangle? (Y/N): n

Would you like to make a square? (Y/N): n

No shapes created

>> A5

Would you like to create a circle? (Y/N): n

Would you like to make a triangle? (Y/N): n

Would you like to make a square? (Y/N): y

You only created a single shape: square

>> A5

Would you like to create a circle? (Y/N): y

Would you like to make a triangle? (Y/N): n

Would you like to make a square? (Y/N): y

You created these shapes:

circle

square

Choose two shapes to calculate the distance between centers.

You must spell them EXACTLY as they were written

First shape: circle

Second shape: square

The distance between the circle and the square is 2.236

Choose two shapes to calculate the ratio of the areas.

You must spell them EXACTLY as they were written

First shape: square

Second shape: circle

The ratio of the areas (square:circle) is 0.063

ITP 168 – Introduction to MATLAB Spring 2016

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Grading Item Points

Part 1: Creating Shapes 10 Part 2: How Many? 10 Part 3: Find Distance 20 Part 4: Ratio of Areas 20 Total* 60

*Points will be deducted for poor code style

Deliverables

1. A compressed HW6.zip folder containing the file named HW6.m. It must be submitted through

Blackboard.

This assignment is due: Friday, March 11 2016 at 11:59:59pm