How to generate numbers between[-1 0] in for loop for half iterations and for other iterations it goes from [0 -1]

Question

sara 2014-8-18

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编辑： Vitali Avagyan 2014-8-26

if I am using "for loop" and for that I want to generate numbers that are in ascending order between [-1 0] then after half of my iterations I want to go back from 0 to -1 then what will be it's command?

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Andrew Reibold 2014-8-18

编辑：Andrew Reibold 2014-8-18

random numbers?

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Answer 1

Geoff Hayes 2014-8-18

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编辑：Geoff Hayes 2014-8-18

在 MATLAB Online 中打开

Sara - just use the sort function

 numIters = 50;
 numToGen = 100;
 for k=1:numIters
     % generate your random numbers between -1 and 0
     numbers = -1*rand(numToGen,1);
     if k<numIters
         % sort the data in ascending order
         numbers = sort(numbers,'ascend');
     else
         % sort the data in descending order
         numbers = sort(numbers,'descend');
     end
 end

Try the above and see what happens!

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Answer 2

Vitali Avagyan 2014-8-18

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编辑：Vitali Avagyan 2014-8-26

在 MATLAB Online 中打开

Geoff, I don't think your code does what Sara asked for,

Sara, it looks like from your message that you are looking for the following code:

Iters = 10;%put any number of iterations you want
numbers=zeros(1,Iters);
asc=zeros(1,floor(Iters/2));
desc=zeros(1,ceil(Iters/2));
for k=1:Iters
    for k=1:floor(Iters/2);
        asc(k)=-1*rand;
        numbers_ascend=sort(asc,'ascend');
    end
    for k=1:ceil((Iters/2));
        desc(k)=-1*rand;
        numbers_descend=sort(desc,'descend');
    end
end
    numbers=[numbers_ascend numbers_descend]