Problem 44952. Find MPG of Lightest Cars

Created by Pooja Lalan

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The file cars.mat contains a table named cars with variables Model, MPG, Horsepower, Weight, and Acceleration for several classic cars.

Load the MAT-file. Given an integer N, calculate the output variable mpg.

Output mpg should contain the MPG of the top N lightest cars (by Weight) in a column vector.

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3745 Solutions
356 Solvers

Last Solution submitted on Apr 10, 2020

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Paul Hoffrichter on 2 Mar 2020

Never worked with Tables before. Does Cody offer any ways to debug?

Paul Hoffrichter on 2 Mar 2020

Answer: I am able to print intermediate results.

Arman Lalani on 19 Mar 2020 at 14:20

I am getting the answer but the order of elements in my vector doesn't match the required answer. How can I get it in the required order?

Hugo Ormo on 5 Apr 2020 at 11:30

I do not see why this does not work. It seems to work in the Workspace alright:
function mpg = sort_cars(N)
cars = load('cars.mat')
carsSorted = sortrows(cars,'Weight')
mpg = carsSorted.MPG(1:N)
end

Pooja Lalan on 7 Apr 2020 at 13:14

@Hugo, check syntax for load in the documentation https://www.mathworks.com/help/matlab/ref/load.html

Specifically, check what to expect when assigning output from load to a variable.

Hugo Ormo on 7 Apr 2020 at 15:51

ty @Pooja :)

Peter Chiappetta on 9 Apr 2020 at 0:15

I have been working at this for a bit and it seems like it should work, What am I missing?
function mpg = sort_cars(N)
load('cars.mat')
A = sortrows(cars,'Weight')
mpg=A(1:N,2)
end

Solution Comments

Solution 2172277

2 Comments

2 Comments

Adetiloye Joseph Bamisebi on 24 Mar 2020 at 10:00

I do not understand why this code failed assertion test even though it yields the correct answer

function mpg = sort_cars(N)
load cars.mat
sorted = sortrows (cars,4)
n = N
mpg = sorted(1:n,2)
end

Pooja Lalan on 7 Apr 2020 at 12:55

The output is expected to be a column vector, whereas your code returns a table.

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Problem 44952. Find MPG of Lightest Cars

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Problem 44952. Find MPG of Lightest Cars

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