Finding patterns in my array

Hello

I'm trying to find a pattern within my matrix and then store and label that found pattern in a separate array. The code i have develop so far is as below, where roundData is my my 20x20 Matrix. The matrix consists of integers of 1-5 and Im trying to source from the whole array if a set of numbers such as all 1's form a block

1 1

1 1

Such as above. Once this pattern has been found it will store into another array showing that pattern has been found and denoted by anything else, eg an x or something. I'm wondering where in my code have i gone wrong and how do i store it in another array.

mapValue = 0;
mapValue1 = 0;
mapValue2 = 0;
mapValue3 = 0;
for r = 1:MAX_ROWS - 1
    for c = 1:MAX_COLUMNS - 1   

       mapValue = roundData (r,c);

       mapValue1 = roundData (r,c+1);

       mapValue2 = roundData(r+1,c);

       mapValue3 = roundData (r+1,c+1);      

        if mapValue == mapValue1 && mapValue == mapValue2 && mapValue == mapValue 3;    

        end                  
    end
end

[Image Analyst]

Original question in case he deletes it like he's done with other posts:

Hello

I'm trying to find a pattern within my matrix and then store and label that found pattern in a separate array. The code i have develop so far is as below, where roundData is my my 20x20 Matrix. The matrix consists of integers of 1-5 and Im trying to source from the whole array if a set of numbers such as all 1's form a block

1 1

1 1

Such as above. Once this pattern has been found it will store into another array showing that pattern has been found and denoted by anything else, eg an x or something. I'm wondering where in my code have i gone wrong and how do i store it in another array.

mapValue = 0;
mapValue1 = 0;
mapValue2 = 0;
mapValue3 = 0;
for r = 1:MAX_ROWS - 1
    for c = 1:MAX_COLUMNS - 1   

       mapValue = roundData (r,c);

       mapValue1 = roundData (r,c+1);

       mapValue2 = roundData(r+1,c);

       mapValue3 = roundData (r+1,c+1);      

        if mapValue == mapValue1 && mapValue == mapValue2 && mapValue == mapValue 3;    

        end                  
    end
end

Answer 1

[Massimo Zanetti]

Assume A is you matrix with values from 1 to 5. You can map automatically the entries having the same value in this way:

C = cell(1,5);
for k=1:5
  C{k} = (A==k);
end

Every C{k} is a logical matrix storing the positions of the numbers.

[Matlabhelp]

So what this has essentially done is found each value from 1-5 in my array and e and denoted them by 1 in each of their own 20x20 cells?

[Matlabhelp]

I would also like to ask that if it were possible for each cell to only store the numbers which show a certain pattern? Rather than storing each position of numbers. Or is there a way to reference these now newly stored cells and denote where a pattern is

[Matlabhelp]

I really appreciate the help and excuse my many many questions hahaha, but how do i use the bwconncomp function. As stated in my original post how would you use this function to find pattern that consists of 3 ones in a single row and use it to search that whole array

[Matlabhelp]

I'm unfamiliar with how to use this function. Would you be able to provide an example, it's easier for me to see what is what and what needs to be defined in order to use this function to my full advantage.

[Matlabhelp]

I've had a read through and some elements of the page itself confuse me.

Just to clarify, BW = my array?

How does the CC = bwconncomp factor into the function?

[Massimo Zanetti]

Sorry, wrong function. Better to use regionprops, asking for the area of the connected regions:

https://it.mathworks.com/help/images/ref/regionprops.html#inputarg_properties

   S = regionprops(C{1},'Area')

Inspect S to get more familiar.