I need to replace all the negative values with a reacuring loop of random values.

SO I need to have a vector of random values (between -10 and 10) then replace the negative integers with another random number (using a while loop I assume) until all the numbers are positive. After all that is done I need to count the number of times it took before all the numbers became positive ( I will probably use count to do this) This is a suggested homework question that I have been stuck on for 2 weeks and I can tell that something similar is going to be on the exam next week.

Here is what I have so far.

a=-10; % min value 
b=10; % max value

v = randi([-10,10],1,20) % generates Vector with 20 random integers 
R = randi([-10,10],1,20) % Another random array to replace values

for n=1:10              %  How can I use a while loop in this case?

idx = v < 0             % Am I doing the indexing right?

v(idx) = R(idx) 

                        %finally How can I make the count?

end

Answer 1

[Konstantinos Sofos]

Hi,

There many and different solutions on your problem

r1 = randi([-10,10],1,20); % first sample
idx = find(r1<0); % indexation of negatives
counter = 0; % initialize a counter
while any(idx)~=0
   r2 = randi([-10,10],1,20);
   r1(idx)=r2(idx);
   idx = find(r1<0);
   counter = counter + 1;
end
fprintf('Counter = %d\n',counter)

Regards

[Walshaikhli]

Bro youre a life saver!