Problem 44945. Calculate BMI

Created by Pooja Lalan

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23752 Solutions
4746 Solvers

Last Solution submitted on Jan 24, 2022

Last 200 Solutions

Problem Comments

10 Comments

10 Comments

Show 7 older comments

Anel Ruiz on 22 Apr 2020

Nice

Kiran Jojare on 4 May 2020

function bmi = bmi_calculator(hw)
h_inch = hw(:,1);
h_m = h_inch .* 2.54/100;
w_pounds = hw(:,2);
w_kg = w_pounds .* 0.453592;
BMI = w_kg / (h_m .* h_m);
bmi= BMI(:,end);
end

IM GETTING ASSERTION ERROR....EVEN THOUGH IT GIVES ME EXACT OUTPUT ON MY MACHINE. ANYONE HAVING IDEA ABOUT THIS ?

Abhishek Sreekant on 6 May 2020

was getting an assertion error but finally got it after 15 minutes of brainstorming

HARSH RAITHATHA on 8 Nov 2020

function bmi = bmi_calculator(hw)

% Convert the height values from inches to meters
height=hw(:,1)./(2.54*10^-2)

% Convert the weight values from lbs to kilograms
weight=hw(:,2)./2.2

% Calculate the bmi for height and weight combination and return the output variable 'bmi'

bmi = weight./(height.^2);
end

can anyone help me to find the aassertion error?

CMdC on 23 Jan 2021

Nice one!

Michael Green on 8 Feb 2021

Can anyone explain why

"bmi = convmass(hw(:,2),'lbm','kg') ./ (convlength(hw(:,1),'in','m').^2);"

doesn't work?

goc3 on 9 Feb 2021

@Michael Green: thanks for pointing out convmass and convlength...I did not know that those existed.
Your attempt doesn't work because of conversion round-off. The author indicates that 1" = 2.54cm. That conversion is exact and matches convlength.
The author also indicates that 1kg = 2.2lbs. That conversion is rounded, whereas convmass utilizes a more accurate conversion factor (2.2046). If you use the conversion factor indicated by the author (i.e., don't use convmass), it will work.

Bob DeFour on 10 Jun 2021

My solution passes the first test and I have 4 decimal place accuracy yet I fail the second test. Not sure how this is possible even if the conversion factors aren't the same. By the way, my answer using the values chosen for the second test exactly match those calculated using the NIH calculator.

Isabella Stellitano on 14 Nov 2021

Good problem

Jose Matos on 30 Nov 2021

The comments in the solution are there just to help. The solution can be done in a single statement to improve the size.

Solution Comments

Solution 7363860

2 Comments

2 Comments

Anand Venugopal on 11 Jan 2022 at 12:33

The tolerance in assert is very high. Its not worthwhile to tune the decimal places to get that tolerance.
Reconsider the problem and reduce the tolerance.

Dyuman Joshi on 11 Jan 2022 at 14:56

This is the standard tolerance used in Cody. You'll encounter that frequently with many problems involving floating point numbers. There is nothing unsolvable/hard specifically about it.

Solution 7286105

Solution 6970719

1 Comment

1 Comment

Haoran Tian on 26 Nov 2021

interesting question

Solution 6931044

1 Comment

1 Comment

Josh Klueber on 21 Nov 2021

nice problem

Solution 5875710

1 Comment

1 Comment

ILYAS BOUALLAL on 30 May 2021

Your first verification is FALSE

Solution 5046273

1 Comment

1 Comment

李君 on 12 Mar 2021

be careful about the unit convertion,
height = hw(:,1) * 2.54 / 100;

Solution 4728952

2 Comments

2 Comments

Samer Habbal on 3 Feb 2021

I made a good answer. and I was able to test hem in my desktop MATLAB but I got error with testing the first status here "error using assert"

goc3 on 3 Feb 2021

Your function is returning the result as a row vector rather than a column vector. MATLAB defaults to writing results as a row vector when only one dimension is specifed, so change your for-loop assignments to bmi(i,1) = ... to force a column vector (or transpose bmi after the loop).

Solution 3957083

3 Comments

3 Comments

Cutie on 1 Jan 2021

Please, do we need to sum up values of all rolls and columns respectively to calculate the BMI?

JIYON PJ on 13 Apr 2021

No. Use Elementwise operations.

Paul Manohar Golla on 6 Jan 2022 at 17:14

Using regex just to wrap the entire code is just a tricky way of winning. The solution is no better than the others.

Solution 3952818

4 Comments

4 Comments

Show 1 older comment

aziz muhammed akkaya on 2 Dec 2020

I solved the problem but the weird thing is that I had to multiply the bmi result with 10000 ro get the right results. Somehow the results without the multiplication were not the exact results. Have anyone faced the same things?

William Veitch on 10 Dec 2020

Did you use height in cm instead of in metres?

Dyuman Joshi on 24 Feb 2021

You have converted inches to centimeters and not meters by using the conversion factor 2.54.

aziz muhammed akkaya on 15 Mar 2021

Ah yes, thank you for pointing out guys, and sorry for the late response :/

Solution 3188081

1 Comment

1 Comment

Harsh Gupta on 13 Oct 2020

"The condition input argument must be convertible to a scalar logical."
how this error is rectified?

Solution 2712015

Solution 2644735

1 Comment

1 Comment

evan muas on 2 Jul 2020

Dividing height in inches by dividing by 39.37 fails. However, 39.3701 passes first test but fails the second. I had to find a closer value to satisfy second test, 39.37008. You should improve the test parameters.

Solution 2378353

1 Comment

1 Comment

suman Bhullar on 26 May 2020

bmi_correct and bmi_calculator are same. even then I am getting assertion error

Solution 2297265

Solution 2239243

1 Comment

1 Comment

Anandha Krishnan Sridharan on 27 Apr 2020

What is wrong i this code, The final answers are also matching but it is showing as a fail, I am not getting it.

Solution 2237167

1 Comment

1 Comment

Vijay Anand Ramachandran on 26 Apr 2020

Leading solution is not correct. The code has comment to convert the height and weight seperately followed by the bmi computation. bmi should not be calculated in one line of code as in leading solution by crunching all the factors.

Solution 2231118

1 Comment

1 Comment

Shivam Gautam on 23 Apr 2020

a very narrow range of assertions. The solution is correct, but can not proceed due to narrow limits of the assertions.

Solution 2138479

1 Comment

1 Comment

Pooja Lalan on 24 Feb 2020

The problem specifies that the input hw is a matrix with two columns (not a table). So, the error is saying that you cannot use dot indexing on a matrix.

Solution 2111675

1 Comment

1 Comment

John Reynolds on 30 Jan 2020

Didn't know this is how simple BMI is.

Solution 2091052

2 Comments

2 Comments

Ewan on 13 Jan 2020

I've got the right values but I've failed the assertion somehow?

Pooja Lalan on 14 Jan 2020

The expected output is a column vector containing ALL the bmi values, whereas your code returns a single bmi value i.e. the last one. Hope that helps!

Solution 2040914

1 Comment

1 Comment

Asif Newaz on 1 Dec 2019

increase the tolerance value..i had to be very specific to match the result

Solution 1917777

1 Comment

1 Comment

Dwarakesh Divya Kanth Padala on 22 May 2020

Nice!

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indexing matrix manipulation

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Problem 44945. Calculate BMI

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