Hi, how do I cause the following code to recognize that 92 for q and 92 for v are both passing scores, right now it returns false.

function tf = eligible( v,q )
  %ELIGIBLE Summary of this function goes here
  %   Detailed explanation goes here
  tf ='false';
  avg = (v+q)/2;
  if avg >=92
    if v>88 && q>88
      tf ='true';
    end
  end
end

Hi, how do I cause the following code to recognize that 92 for q and 92 for v are both passing scores, right now it returns false but it should return true for 92 for q and v

[DJ V]

function tf = eligible( v,q ) 
%ELIGIBLE Summary of this function goes here \
% Detailed explanation goes here 
tf ='false'; 
avg = (v+q)/2; 
if avg >=92 
    if v>88 && q>88 
        tf ='true'; 
    end 
end 
end

Here is the code.

[dpb]

>> eligible(92,92)
ans =
true
>>

seems to work as expected here. Perhaps you've not clear ed an earlier edit that doesn't work correctly from memory? Or the copy you're executing isn't the same as this one...try

which eligible  % to see who's actually the one being found.

Answer 1

[Image Analyst]

Don't put quotes around true and false. That's setting them equal to character arrays, which you don't want. You want the boolean/logical values.

[dpb]

Good point; mayhaps that's the issue, not the logic as I read it. If his test were

if elgible(92,92)
  dosomething
else
  somethingnottheabovesay
end

he'd always get the else clause despite seeing 'true' as the output...

[Image Analyst]

I've tagged this as homework since it's the same as another question: http://www.mathworks.com/matlabcentral/answers/298895-how-do-you-have-a-logical-operator-of-true-and-false-as-your-type-but-0-and-1-as-your-value

Answer 2

[Walter Roberson]

Are you certain that the values you are passing in are exactly 92? If they are exactly 92, then the way you calculate the average and compare that to 92 should work, but if the values are even one significant bit less than 92, then even though they would look like 92 when displayed, their average would be less than 92 and so the comparison you used.

n92 = 92 * (1-eps);

>> (n92+n92)/2 - 92
ans =
      -1.4210854715202e-14