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

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Walshaikhli
Walshaikhli 2015-3-10
评论： Walshaikhli 2015-3-10
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

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Konstantinos Sofos
Konstantinos Sofos 2015-3-10
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

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