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replace matlab function with algorithm

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Josaiah Ang
Josaiah Ang on 27 May 2015
Commented: Josaiah Ang on 28 May 2015
this is my current code. how do i replace the isperfect function to n = p1 · p2 · ... · pt
disp('Perfect numbers!');
disp('Enter two numbers(intervals)');
num1 = input('Enter num1 value: ');
num2 = input('Enter num2 value: ');
fprintf('Perfect numbers between %d and %d are: ', num1, num2);
for i = num1:num2
if isperfect(i)~=0
fprintf('%d, ',i)
end
end

  3 Comments

dpb
dpb on 27 May 2015
I dunno...what do you think is a "perfect" number?
Adam
Adam on 27 May 2015
isperfect is not a builtin Matlab function so I don't see what the problem is. You can program an algorithm in a function called isperfect just like any other function.
Indeed, if such a function doesn't exist on your system then that code will not run anyway.
Josaiah Ang
Josaiah Ang on 27 May 2015
thank Adam. thanks for the clarification. in this case, is something wrong with the code for me to get the perfect number?

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Answers (2)

Al Dente
Al Dente on 27 May 2015
Edited: Al Dente on 27 May 2015
your tags say prime, so I assume you want to find out prime numbers:
isprime(i)~=0
would that be the answer to your question?

  1 Comment

Josaiah Ang
Josaiah Ang on 27 May 2015
sorry i tag wrongly.
i want to display the perfect numbers between the 2 input by user.

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Roger Stafford
Roger Stafford on 27 May 2015
I have given you a pretty good hint four days ago at solving your problem in the #218267 Answers thread. Why don't you try using it?

  3 Comments

Josaiah Ang
Josaiah Ang on 27 May 2015
Thank you Roger. Appreciate the hint you have given. As I just picking up matlab 2 weeks ago, Im kinda lost with the hint you have given. Apologies for that obvious hint you have given.
Roger Stafford
Roger Stafford on 28 May 2015
In all your remarks, Josaiah Ang, there is no evidence that you actually understand the meaning of a perfect number. If that is true, getting an understanding should be your next move. You can read about it at:
http://en.wikipedia.org/wiki/Perfect_number
or at a number of other sites as well.
Your next move after that should be to do some computation by hand and see why 6 and 28 are perfect numbers and others in between are not.
At that point you will hopefully be ready to make use of the hint I have given you in #218267.
Josaiah Ang
Josaiah Ang on 28 May 2015
Hi Roger, Do you think i'm anywhere close to that?
disp('Perfect numbers!');
disp('Enter two numbers(intervals)');
num1 = input('Enter num1 value: ');
num2 = input('Enter num2 value: ');
fprintf('Perfect numbers between %d and %d are: ', num1, num2);
for N = num1:num2-1;
S = sum(N(mod(n,N)==0));
fprintf('%d, ',s)
end
end

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