How to find values for corresponding start and end positons

Asked by Wind flower on 20 Jun 2019

Latest activity Edited by madhan ravi on 21 Jun 2019

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My data is as follows stored in excel.

bit bit2

1 3

1 5

1 22

1 25

0 10

0 15

1 17

1 19

1 12

I had to find the position of first and last 1 bit of each set of 1 .. so i got answer lik this

start 1 7

end 4 9

Now i have to print or save (excel or word) bit2 values for corresponding start and end positons

2 Comments

Akshay Malav on 20 Jun 2019

Can you please elaborate your statement regarding finding position of first and last 1 bit and also the start and end mentioned by you

Wind flower on 21 Jun 2019

So i want the position of bit 1(colored) and its corresponding values of bit2 to be displayed

2 Answers

Link

Answer by madhan ravi on 21 Jun 2019

Edited by madhan ravi on 21 Jun 2019

Getting the start and positions , i believe you know it from the previous question, so don‘t waste time using a loop.

bit1 =[...
     1
     1
     1
     1
     0
     0
     1
     1
     1]
bit2 =[...
     3
     5
     22
     25
     10
     15
     17
     19
     12];
Start = [1,7];
End = [4,9];
Positions = [Start;End].'; % first column represents start of each group and the second the end.
Sets = arrayfun(@(x,y)bit2(x:y),Positions(:,1),...
    Positions(:,2),'un',0)

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Answer by Akshay Malav on 21 Jun 2019

Here is the sample code

filename = 'mysheet.xlsx';     %read the excel filr
A = xlsread(filename);         %store the content in A Matrix
[row col] = size(A);           %find the size of the Matrix
array = [];                    %array which will have the bit2 value
i=1;
while i<=row                   %iterating through the bit 1 column
    
    j=i;
    if A(j,1)==1                % the starting point of the set of 1
        
       array = [array A(j,2)];        % store the corresponding bit2 in array
       while j<=row & A(j,1)==1        % loop till we find 0
              j=j+1;
              
       end
       array = [array A(j-1,2)];    %store the final bit2 value
      i=j;
    
    else                            % update i
        j=j+1;
        i=j;
    end
end

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How to find values for corresponding start and end positons

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