could anyone help me to get C from A and B

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Prabha Kumaresan 2018-1-2

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https://ww2.mathworks.cn/matlabcentral/answers/375184-could-anyone-help-me-to-get-c-from-a-and-b

评论： Rik 2018-1-5

If A =
       1     2     3     4     5
      11    12    13    14    15
       6     7     8     9    10
      21    22    23    24    25
      26    27    28    29    30
B =
       0     0    41     0     0
      45     0     0     0     0
       0    43     0     0     0
       0     0     0    42     0
       0     0     0     0    44
and 
C =
       0     0    41     4     0
      45    12     0     0    15
       6    43     0     0    10
       0     0    23    42     0
      26    27     0     0    44

How to obtain C from A and B. the example mentioned here is for (5,5) if it is for (50,100) how it can be done?

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Birdman 2018-1-2

What is your condition for obtaining? There is not a certain pattern or something else for achieving C from A and B.

Prabha Kumaresan 2018-1-2

编辑：Guillaume 2018-1-2

In the example mentioned i am clustering (row 1, row 4) and (row2,row3,row5) from B . As a result of clustering (row1,row4) from B, which has values of(41 in(1,3),42 in(4,4)) gets modified into (41 in (1,3) and 4(from A) in (1,4),23(from A) in (4,3) and 42 in (4,4)).the same condition applies to clustering of ((row2,row3,row5))

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Answer 1

Rik 2018-1-2

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Let me start off by saying you described it very poorly (and formatting your comment as code doesn't help).

What seems to be the goal is adding values to B. The rule for this is that in groups of rows, the entire column must be either 0 or contain a value. If B on that position is equal to 0, the value is taken from A.

For rows 1 and 4:

cluster=[0     0    41     0     0;
         0     0     0    42     0];
non_0=  sum(cluster);
non_0=repmat(non_0,2,1);
A_part=[1     2     3     4     5;
        21    22    23    24    25];
new_cluster=cluster;
new_cluster(non_0 & cluster==0)=A_part(non_0 & cluster==0);

So now the question is how to generalize this to inputs of rows. Personally, I think you should be able to use this code a basis to write your own code for arbitrary row groups. The only thing you need to write is how to extract the clusters and put them back.