Problem 44945. Calculate BMI
 1 kilogram = 2.2 pounds
 1 inch = 2.54 centimeters
 BMI = weight(kg) / [height(m)]^2
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Problem Comments

16 Comments
Nice
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 ?
was getting an assertion error but finally got it after 15 minutes of brainstorming
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?
Nice one!
Can anyone explain why
"bmi = convmass(hw(:,2),'lbm','kg') ./ (convlength(hw(:,1),'in','m').^2);"
doesn't work?
@Michael Green: thanks for pointing out convmass and convlength...I did not know that those existed.
Your attempt doesn't work because of conversion roundoff. 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.
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.
Good problem
The comments in the solution are there just to help. The solution can be done in a single statement to improve the size.
fun
nice!
function bmi = bmi_calculator(hw)
% Convert the height values from inches to meters
height = hw(:,1).*2.54/100
% 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 here? I am getting this error
Error using assert The condition input argument must be convertible to a scalar logical. Error in Test2 (line 4) assert(all(abs(bmi_calculator(hw)  bmi_correct) < 1e4))
@Mohamed in the last line, you're using right matrix division rather than right array division (i.e. elementwise division). Try replacing / with ./  that should fix it.
@Christian Thank you very much for the reply. It worked after replacing as you said
function bmi = bmi_calculator(hw)
% Convert the height values from inches to meters
h=reshape(hw(:,1),1,[]);
h=0.0254*h;
% Convert the weight values from lbs to kilograms
w=reshape(hw(:,2),1,[]);
w=(1/2.2)*w;
% Calculate the bmi for height and weight combination and return the output variable 'bmi'
bmi=w./(h.^2);
end
what is wrong with this, please help. It runs fine on RUN button but does not pass the test
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