Stop value in loop for repeating
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Pallav Patel
le 12 Mar 2020
Commenté : James Tursa
le 12 Mar 2020
clc;
clear;
close all;
rng('shuffle');
myint = randi([4,100]);
while mod(myint,2) ~= 0
myint = randi([4,100]);
end
fprintf('%d is the sum of these prime numbers\n',myint);
myprime = primes(myint);
mylength = ceil(length(myprime)/2);
for i=1:length(myprime)
for k=1:length(myprime)
if(myprime(i)+myprime(k)== myint)
num1 = myprime(i);
num2 = myprime(k);
fprintf('%d = %d + %d \n',myint,num1,num2)
end
end
end
i am trying to create the goldbach conjecture but I do not want the prime numbers that have already been listed to repeat. eg 7+5 and 5+7.
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Réponse acceptée
James Tursa
le 12 Mar 2020
Not sure if you need the numbers to be different or not. Either this:
for k=i:length(myprime)
or this
for k=i+1:length(myprime)
2 commentaires
James Tursa
le 12 Mar 2020
This simply forces myprime(k) to be greater than (or equal to depending on which code you use) the value of myprime(i). So you will never get both the 5 + 7 and the 7 + 5 choices.
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