Most Frequent letter in a Matrix. Help Please!

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João 2013-12-22

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评论： Image Analyst 2014-1-2

Good night all,

I have a group of letters in a matrix, now I want to get a new matrix with the most frequent letter in groups of 4 rows.

So I have a matrix like this;

A

AB

B

(...)

and I want this;

AB

B

(...)

I'm reading the matrix with

[~,txt] = xlsread('Cópia de 2012_15min.xls','JAN','B25:B3000');

and I already tried

res = char( mode( double( reshape( txt, 4, [ ] ) ) ) )

but I'm getting an error

??? Error using ==> double Too many input arguments.

Error in ==> Untitled at 37 res = char( mode( double( txt, 4, [ ] ) ) )

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Answer 1

Image Analyst 2014-1-2

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https://ww2.mathworks.cn/matlabcentral/answers/110479-most-frequent-letter-in-a-matrix-help-please#answer_119847

在 MATLAB Online 中打开

% Create sample data
letters = {...
'A'
'AB'
'AB'
'AB'
'B'
'B'
'B'
'B'}
% Now find unique letter pairs
uniqueLetters = unique(letters)

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João 2014-1-2

编辑：João 2014-1-2

在 MATLAB Online 中打开

That's not making what I want maybe I was not clear. I have 2975 rows, in these rows I have letters like A B AB C, now I want to get a new matrix with the most frequent letters in groups of 4 rows.

So I have A A A A B B B C C C C D (...) and want a new matrix with A B C (...) so I will get a new matrix of letters with 744 rows

I'm now trying to use this code

   [M,N] = size(txt);  %# Matrix size
  nSub = 744;          %# Number of submatrices
  novo = mat2cell(txt,diff(round(linspace(0,M,nSub+1))),N);
for i=1:744
[unique_strings, ~, string_map]=unique(novo{i})
most_common_string(i)=unique_strings(mode(string_map))
end

So I'm trying to split the matrix of 2975 rows into 744 new matrices of 4 rows, now I want to get the most frequent letter in each of the new matrices.

Image Analyst 2014-1-2

Sorry but I don't understand. You say you want "a new matrix of letters with 744 rows" and then you say want "744 new matrices of 4 rows" so I have no idea how many matrices you want (1 or 744) and how many rows (4 or 744) are supposed to be in it or them. And I don't know how you can find " the most frequent letter in each of the new matrices" if you don't count the letters (i.e. take the histogram like I did).

Hopefully someone else will understand you perfectly and supply you with a solution, because I can't.

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