how to use logic array

Question

karishma koshy 2019-8-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474434-how-to-use-logic-array

评论： Jon 2019-8-2

i have a 8x6 logical array

result1 =
  8×6 logical array
 0   0   0   0   0
 0   0   1   0   0
 0   0   0   1   0
 0   0   0   0   0
 1   0   0   0   0
 0   1   0   0   0
 0   0   0   0   1
 0   0   0   0   0

how to use this logical array to extract the values in two matrix assosiated with logical ones

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Guillaume 2019-8-1

@karishma, you asked this question already and I asked for clarification. Instead of clarifying you deleted that question and reposted it with even less information.... and you get asked the same clarifications.

So,if you want help, rather than wasting everybody's time do answer the questions that you're asked and spend time explaining everything clearly.

The question that you deleted was a lot better expressed than what you've written above even though it wasn't clear. It's even less clear now.

Personally, I won't contribute anymore since my input wasn't thought worthwile.

karishma koshy 2019-8-1

Hi Sir

I thought it was not clear and had less information. That why I resubmitted it added informations. Sorry for your inconvenience.

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Answer 1

Jon 2019-8-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/474434-how-to-use-logic-array#answer_385758

It isn't quite clear the specifics of what you want to retrieve but for example if you wanted to get the row in frame 1 that matches row 2 in frame 2 you could use

row = row_frame1_adata(result1(:,2),:)

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karishma koshy 2019-8-1

row_frame1_data =
0000  329.8325  361.1270   22.0027
0000  613.6074  215.8294   28.1989
0000  376.3128  310.3919   22.9178
0000  636.6237  446.4107   27.1672
0000  111.5548  191.3145   24.8943
0000  248.6901  372.9032   41.9425
0000  338.8193    3.1024   23.3755
0000  428.1734  211.9613   23.5272

  row_frame2_data =
0e+03 *
0000    0.3298    0.3649    0.0227
0000    0.1120    0.1875    0.0236
0000    0.2532    0.3690    0.0371
0000    0.6146    0.2172    0.0307
0000    0.3789    0.3079    0.0216
0000    0.2600    0.0271    0.0244
    
    

  FRAME     CENTRE X  CENTRE Y   RADIUS   ID
 
0000  329.8325  361.1270   22.0027   1
0000  613.6074  215.8294   28.1989   4  
0000  376.3128  310.3919   22.9178   5 
0000  636.6237  446.4107   27.1672   
0000  111.5548  191.3145   24.8943   2
0000  248.6901  372.9032   41.9425   3
0000  338.8193    3.1024   23.3755   6
0000  428.1734  211.9613   23.5272
0e+03 *
0000    0.3298    0.3649    0.0227   1
0000    0.1120    0.1875    0.0236   2
0000    0.2532    0.3690    0.0371   3
0000    0.6146    0.2172    0.0307   4
0000    0.3789    0.3079    0.0216   5
0000    0.2600    0.0271    0.0244   6

Jon 2019-8-1

编辑：Jon 2019-8-1

Here is a script which produces the results you show in your example

% example input arrays
row_frame1_data = [
  999.0000  329.8325  361.1270   22.0027
  999.0000  613.6074  215.8294   28.1989
  999.0000  376.3128  310.3919   22.9178
  999.0000  636.6237  446.4107   27.1672
  999.0000  111.5548  191.3145   24.8943
  999.0000  248.6901  372.9032   41.9425
  999.0000  338.8193    3.1024   23.3755
  999.0000  428.1734  211.9613   23.5272];
  row_frame2_data = 1e3*[
    1.0000    0.3298    0.3649    0.0227
    1.0000    0.1120    0.1875    0.0236
    1.0000    0.2532    0.3690    0.0371
    1.0000    0.6146    0.2172    0.0307
    1.0000    0.3789    0.3079    0.0216
    1.0000    0.2600    0.0271    0.0244];
    
    
result1 = logical(...
   [1   0   0   0   0   0
   0   0   0   1   0   0
   0   0   0   0   1   0
   0   0   0   0   0   0
   0   1   0   0   0   0
   0   0   1   0   0   0
   0   0   0   0   0   1
   0   0   0   0   0   0]);
% make arrays into tables
data1 = array2table(row_frame1_data,'VariableNames',{'frame','centre_x','centre_y','radius'});
data2 = array2table(row_frame2_data,'VariableNames',{'frame','centre_x','centre_y','radius'});
% assign id's to data2
data2.id = (1:size(data2,1))';
% find  row numbers in frame1 data that have  matching rows in frame2 data
% (these are the rows of result1 that have a 1 in them)
iRow = find(any(result1,2));
% find row numbers in frame 2 where each match occurs 
[id,~] = find(result1');
% assign these ids in data1
% rows that don't have a matching ID will be assigned NaN
data1.id = NaN(size(data1,1),1); 
data1.id(iRow) = id;
% display results
disp(data1)
disp(data2)
  

Jon 2019-8-2

In each loop iteration you will have to assign your result to some variable (array, structure, table) that is indexed by the loop count. So, for example you could make an array of structures, let's call it S, with fields, frame, centre_x, centre_y, radius, id. At the end of each loop iteration you would then assign the results with something like:

% preallocate array of structures
numFrames = 1000
S(numFrames) = struct('frame',[],'centre_x',[],'centre_y',[],'radius',[],'id'[])
for iFrame = 1:numFrames
    % body of loop where you do all of the work
    % ...
    % save results in output structure
        S(iFrame).frame = data1.frame;
        S(iFrame).centre_x = data1.centre_x;
        S(iFrame).centre_y = data1.centre_y;
        S(iFrame).radius = data1.radius;
        S(iFrame).id = data1.id;
end

Note, that if you are doing all of the work inside of the loop, and all you care about is the final output structure, S, it is not really necessary to be creating those intermediate tables. I just used those in the example because it organized things well ,and gave a nicely formatted output with column headings. So if efficiency is a concern, you could rework the piece I gave you to do the same calculations but not bothering to put the values into the temporary tables. Alternatively, rather than using an array of structures, S, you could accumulate all of your results into a large table with an additional column indicating the frame count. You will have to work out the details for what works best for you.

karishma koshy 2019-8-2

编辑：karishma koshy 2019-8-2

Hi Sir

i am new to matlab. Can I know how to accumulate all of my results into a large table with an additional column indicating the frame count.

ans =
  12×12 logical array
 0   0   0   0   0   0   0   0   0   0   0
 0   1   0   0   0   0   0   0   0   0   0
 0   0   0   0   0   0   0   0   0   1   0
 0   0   1   0   0   0   0   0   0   0   0
 0   0   0   0   0   0   0   0   1   0   0
 0   0   0   0   1   0   0   0   0   0   0
 1   0   0   0   0   0   0   0   0   0   0
 0   0   0   1   0   0   0   0   0   0   0
 0   0   0   0   0   0   0   1   0   0   0
 0   0   0   0   0   0   0   0   0   0   1
 0   0   0   0   0   0   1   0   0   0   0
 0   0   0   0   0   1   0   0   0   0   0
ans =
  12×10 logical array
 0   0   0   1   0   0   0   0   0
 0   1   0   0   0   0   0   0   0
 1   0   0   0   0   0   0   0   0
 0   0   0   0   0   0   1   0   0
 0   0   1   0   0   0   0   0   0
 0   0   0   0   1   0   0   0   0
 0   0   0   0   0   0   0   0   0
 0   0   0   0   0   0   0   0   1
 0   0   0   0   0   0   0   0   0
 0   0   0   0   0   0   0   0   0
 0   0   0   0   0   0   0   1   0
 0   0   0   0   0   1   0   0   0
    frame    centre_x    centre_y    radius    id
    _____    ________    ________    ______    __
      479.1      90.612     21.803     1
     653.78       337.1     25.102     2
     130.59      134.18     27.875     3
     297.99      323.38     39.806     4
     31.044      444.48     24.755     5
     350.96      53.437     43.816     6
     64.647      153.47     28.745     7
     293.48      169.92     36.579     8
     499.11       389.5     23.527     9
      426.5      328.29     22.962    10
      504.9      341.25     22.605    11
     620.52      413.07     28.185    12
    frame    centre_x    centre_y    radius    id
    _____    ________    ________    ______    __
     477.56      91.105     21.183     1
     64.259      150.29     27.273     7
     656.85      336.45      25.55     2
     297.95      324.68     40.698     4
     290.52      169.55     36.328     8
     344.63      48.536     43.103     6
     545.61      55.824     21.631     12
     354.06      380.63     25.841     11
     220.45      517.57     22.873     9
      139.3      281.79     27.241     5
     128.34      125.05     37.728     3
     244.67      359.59     28.057     10
      
      frame    centre_x    centre_y    radius    id
    _____    ________    ________    ______    __
     545.37      58.505     23.106     12
      657.4      334.62     26.254     2
     64.807      146.06     27.312     7 
     290.86      167.79     35.758     8
     477.65      89.518      21.65     1
     344.11      44.368     44.039     6
     621.32      408.27     24.244     13
     310.51      329.82     21.516     10
     72.627      113.72     23.659     3
     520.64       404.6      22.33     14
      
      
      
      
      

how can i get the above resultie the long table so on till 1000 frame

karishma koshy 2019-8-2

Dear Sir,

I know what to do theoretically, but I'm new to coding.

That's why I am stuck with this.

Jon 2019-8-2

Your application is quite complicated and probably is not a good place to start learning how to code. I would suggest that if you have not done so already you should first complete the free MATLAB On Ramp training,

https://matlabacademy.mathworks.com/

Make sure you work your way all the way through this and don't skip any steps.

After you complete the training and come back to your problem I think you will find you will be able to code a solution.

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Answer 2

Jackson Burns 2019-8-1

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https://ww2.mathworks.cn/matlabcentral/answers/474434-how-to-use-logic-array#answer_385759

You can use Masking to index your array of results. Try this:

row_frame_data(result1)

Where row_frame_data is the 8*6 atrix of results and result1 is the logical matrix of the values you want.

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karishma koshy 2019-8-1

编辑：karishma koshy 2019-8-1

In horizontal it's the number of elements in frame k and in vertical it's the number of elements in frame k+1 ie it's 8x6 array. The logical array was obtained using Hungarian algorithm

Jackson Burns 2019-8-1