Code printing double line

Question

Laeya 2018-5-31

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/403355-code-printing-double-line

评论： Paolo 2018-5-31

num1 =input('Enter your 1st number: ');
num2 =input('Enter your 2nd number: ');
 %returns an 1-by-num2 matrix of zeros
 PerfectNumber= zeros(1,num2);
 for pp = num1:num2 % pp = Potential Perfect number, variable for the range 
    if true
    end
    pd = 1:pp-1;
    %test all potential numbers up to pp-1 because of the definition of a perfect number.
    %potential divisors, named 'pd' in the code
    if (sum(pd(mod(pp,pd) == 0)) == pp)
        %mod(pp,pd) returns the remainder after dividing pp by pd. 
        %If a number is a divisor, the remainder is 0, so mod return zero.
        %check if the sum of all divisors = pp
        PerfectNumber(pp) = pp;
        %it have found a perfect number and store this number in a variable 'output' at the pp'th position
           if false
          else PerfectNumber (PerfectNumber == 0) = []; 
          %all positions where output is 0 are replaced by the empty matrix []
            fprintf ('\nThe Perfect Numbers are : %d', PerfectNumber);
          %And it will print out the name line + the perfect number
        end
    %After this loop we have the perfect numbers at the position of the perfect numbers.
    end
end
fprintf ('\nThe program ends here, Good bye %s !',un);
    %to inform the user that the program has ended or when the entry is invalid it end the program.
  end

And my out put would be

 Enter your 1st number: 1
 Enter your 2nd number: 50
 The Perfect Numbers are : 6
 The Perfect Numbers are : 6
 The Perfect Numbers are : 28
 The program ends here, Good bye  !>>

What should i do to my code so that it only print the line "The Perfect Numbers are : 6" once and not double like this.

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Paolo 2018-5-31

在 MATLAB Online 中打开

Try changing:

PerfectNumber(pp) = pp;

to

PerfectNumber = pp;

Laeya 2018-5-31

Thank you so much ! yours work well too !

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Answer 1

Rishabh Rathore 2018-5-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/403355-code-printing-double-line#answer_322627

编辑：Rishabh Rathore 2018-5-31

在 MATLAB Online 中打开

What is happening is that you are actually printing the whole vector instead of the latest 'perfect Number'.

Make your print line look like below.

fprintf ('\nThe Perfect Numbers are : %d', PerfectNumber(end));

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Laeya 2018-5-31

Thank you so much for the help! been stuck on this for so long!!

Paolo 2018-5-31

在 MATLAB Online 中打开

The question here is whether you need all the numbers in PerfectNumber in a different stage of the code. If you do not, there is no reason for you to have

PerfectNumber(pp) = pp;

as I mentioned in the comment.

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