replace matlab function with algorithm

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Josaiah Ang
Josaiah Ang 2015-5-27
评论： Josaiah Ang 2015-5-28
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
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Adam
Adam 2015-5-27
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 2015-5-27
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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回答（2 个）

Al Dente
Al Dente 2015-5-27
编辑：Al Dente 2015-5-27
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?
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Josaiah Ang
Josaiah Ang 2015-5-27
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 2015-5-27
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?
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Roger Stafford
Roger Stafford 2015-5-28
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 2015-5-28
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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