pasting row elements as matrix

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nadirvirk Virk
nadirvirk Virk 2011-5-11
Hi All, I new with matlab and right now am into a difficulty such that,I have a matrix like below b11 =
1 2
3 4
5 6
7 8
9 10
11 12
13 14
Now I am trying to create a new matrix (C) from this b11 matrix such that all elements in first row are copied in C with N replications and then same should be done for the next row till we reach last rowof b11 and the order of the C matrix will be (N) x (cols(b11)*rows(b11))!
I am trying this two for loops such that
for p=1:2:11
for i=1:6
b111(:,p:p+1)=repmat(b11(i,:),174,1);
end
end
But instead of looping and replicating all elements of each row, I only get the last two rows replicated 6 times which is required to be last two columns of C matrixotherwise.
Any help will be great since I am just beginning here.
Thanks and Regards
Nader
  2 个评论
Sean de Wolski
Sean de Wolski 2011-5-11
Can you provide the expected result for this example (or subset of this example)?
i.e.
What do you want it b11 = [1 2; 3 4]
Andrei Bobrov
Andrei Bobrov 2011-5-12
give the correct result for:
N = 2;
B11 = [1 2; 3 4];
C =?

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采纳的回答

Sean de Wolski
Sean de Wolski 2011-5-12
b = [ 1 2
3 4
5 6
7 8
9 10
11 12
13 14];
N = 7;
c = repmat(reshape(b.',numel(b),1).',N,1)
If this is not what you want, please give the result as Andrei and I have suggested.

更多回答（3 个）

Laura Proctor
Laura Proctor 2011-5-11
I think that you would like something like this:
N = 10;
C = repmat(b11,[1,1,N]);
C = permute(C,[3,2,1]); % to bring it to the size N * cols * rows
But, seeing the expected result would be helpful... I'm not sure if you want a 3D matrix or a 2D matrix - I created a 3D matrix because of what you term the "order of the C matrix".
Originally, upon reading your question, I thought something like this code would be the solution:
C = repmat(b1,1,N);
Sean de Wolski
Sean de Wolski 2011-5-11
Or do they mean:
C = kron(b1,ones(N,2))
?
nadirvirk Virk
nadirvirk Virk 2011-5-12
Thanks for your replies Laura and Sean de... My resultant matrix C or as i named in code as b111 is two dimensional matrix not three such that rows = N and columns K = rows(b11)*cols(b11)!
I will use the C as the resultant matrix name from here on for clarity Now repmat does not help me here because it tiles up the whole matrix b11 in N rows or columns!
But as I tried to explain my need is to get a resultant matrix C from the elements of b11. Which should take the first row across all the columns in b11 and copies it to C 'N' times in the first 2 columns (since cols of b11=2) then it repeats the same with the next row elements in b11 and paste them in 3rd and 4th column of C again N times and finishes off while copying the last row elements in C (again N times) in column K-1 and K (in this case they will be 13th and 14th)! Lets c if could be done somehow and I put the problem with more clarity! Thanks

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