Conditional replacement of a vector of zeros and ones

Question

David Schwartzman 2019-4-4

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https://ww2.mathworks.cn/matlabcentral/answers/454391-conditional-replacement-of-a-vector-of-zeros-and-ones

编辑： Andreas Bernatzky 2019-4-4

Hi All,

I have an array of zeros from 1:400 and want to randomly assign ones in 10 positions for every 40 zeros in the sequence.

cycles = 40;
count = 0;
state = zeros(1, 400);
for i = 1:cycles
    tempstate = state(count:count+cycles)
    for j = 1:10
        tempstate(randi(numel(tempstate))) =1
    end
    count = count + 40

The issue I have is that I want wherever I assign a one to have a zero either side.

But still maintain 10 1's per 40 positions in the sequence.

Appreciate the help.

Thanks,

David

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Answer 1

Andreas Bernatzky 2019-4-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/454391-conditional-replacement-of-a-vector-of-zeros-and-ones#answer_369053

编辑：Andreas Bernatzky 2019-4-4

在 MATLAB Online 中打开

Hey David,

this should do the Job. Sorry for my Variablenaming but I could not consider better names :)

sequence=40;
vectors2create=400/sequence;
amountofOnes=10;
finalVector=[];%end vector
for(a=1:1:vectors2create)
    
    tempVec=zeros(1,40);
  
        for(b=1:1:amountofOnes)
           onePos(b)=randi(sequence,1);%determine the positions which become 1 
        end
        
        tempVec(onePos)=1;%set the positions to 1
        finalVector=[finalVector,tempVec];%append the final vector
end

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David Schwartzman 2019-4-4

Hi Andreas

Exactly right, someitmes I am seeing 0 1 1 0 in finalVector which is not allowed always needs to be 0 1 0

Thanks

David

Andreas Bernatzky 2019-4-4

编辑：Andreas Bernatzky 2019-4-4

在 MATLAB Online 中打开

Should do the work now.

sequence=40;
vectors2create=400/sequence;
amountofOnes=10;
finalVector=[];%end vector
for(a=1:1:vectors2create)
    
    tempVec=zeros(1,40);
        onePos=[];
        while(length(onePos)<amountofOnes)
          tempPos=randi(sequence,1);%determine the positions which become 1 
                cAP=tempPos-1;%checkAscendingPos
                cDP=tempPos+1;%checkDescendingPos
                cOP=tempPos;%checkOwnPos
                %if non of this position(or neighbouring) does appear in onePos this Position can be accepted
                if(isempty(find(cAP==onePos))==1&&isempty(find(cDP==onePos))==1&&isempty(find(cOP==onePos))==1)
                    onePos(end+1)=tempPos;
                end
                
        end
        
        tempVec(onePos)=1;%set the positions to 1
        finalVector=[finalVector,tempVec];%append the final vector
end

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Conditional replacement of a vector of zeros and ones

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Conditional replacement of a vector of zeros and ones

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