Merge nx3 double matrices present within a 3x1 cell

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Alberto Acri
Alberto Acri 2022-12-11
编辑： Stephen23 2022-12-11
I have the following generic code that generates me a 3x1 "output" cell.
a=randi(100,157,2);
b=randi(200,189,2);
c=randi(300,183,2);
mat={a;b;c};
for i=1:size(mat,1)
if i==1
aaa(i)={[mat{i,1} repmat(100,size(mat{i,1},1),1)]};
elseif i==2
aaa(i)={[mat{i,1} repmat(150,size(mat{i,1},1),1)]};
elseif i==3
aaa(i)={[mat{i,1} repmat(200,size(mat{i,1},1),1)]};
end
end
output=aaa';
The internal of "output" is characterized by:
157x3 double
189x3 double
183x3 double
I would like to try to merge all the matrix (nx3), present inside "output", into one array (an example like this: link)
I used the following code but it gives an error due to the fact that the number of rows in each matrix is different.
matrix = [];
for nbr = 1:3
matrix = [matrix, output{nbr,1}];
end
  1 个评论
Stephen23
Stephen23 2022-12-11
编辑：Stephen23 2022-12-11
Ran in:
Simpler code and much more efficient use of MATLAB:
a=randi(100,157,2);
b=randi(200,189,2);
c=randi(300,183,2);
tmp = {a,b,c};
vec = [100,150,200];
for k = 1:numel(tmp)
tmp{k}(:,3) = vec(k);
end
out = vertcat(tmp{:}) % comma-separated list
out = 529×3
59 31 100 58 60 100 35 98 100 65 48 100 97 91 100 56 49 100 94 77 100 33 4 100 11 89 100 4 56 100
https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html
https://www.mathworks.com/matlabcentral/answers/1656435-tutorial-comma-separated-lists-and-how-to-use-them

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采纳的回答

C B
C B 2022-12-11
Ran in:
a=randi(100,157,2);
b=randi(200,189,2);
c=randi(300,183,2);
mat={a;b;c};
for i=1:size(mat,1)
if i==1
aaa(i)={[mat{i,1} repmat(100,size(mat{i,1},1),1)]};
elseif i==2
aaa(i)={[mat{i,1} repmat(150,size(mat{i,1},1),1)]};
elseif i==3
aaa(i)={[mat{i,1} repmat(200,size(mat{i,1},1),1)]};
end
end
output=aaa';
matrix = [];
for nbr = 1:3
matrix = [matrix; output{nbr,1}];
end
matrix
matrix = 529×3
97 80 100 12 3 100 38 40 100 54 71 100 96 94 100 25 50 100 81 59 100 4 76 100 73 85 100 54 37 100

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