Getting the Row Matrix - matlab

Question

I want to convert a n*n matrix into its respective row matrix in Matlab. How to achieve this ?
For example assume the original matrix is
7.0000 26.0000 6.0000 60.0000 78.5000
1.0000 29.0000 15.0000 52.0000 74.3000
11.0000 56.0000 8.0000 20.0000 104.3000
and I want to get the output as
7.0000 26.0000 6.0000 60.0000 78.5000 1.0000 29.0000 15.0000
52.0000 74.3000 11.0000 56.0000 8.0000 20.0000 104.3000
which is the row matrix.

Answer 1

As you want to reshape it into a vector, reshape might be a bit overkill, as you can just use linear indexing.
A = randi(10,5,5); %Create some matrix
B=A.'; %SLOW
B = B(:).'; %matrix -> vector conversion
On the other hand, the speed of the matrix -> vector conversion does not really matter as it is the initial transpose which is slow, which you'll need for any method, see e.g. Phil's answer.

Answer 2

Easiest solution is:
Anew = reshape(Aold',1,numel(Aold));
Of particular importance is that you need to use the transpose of Aold.

Answer 3

I think what you want is:
reshape(A, 1, []);
where A is your matrix. For example:
A = rand(5,5);
b = reshape(A, 1, []);
will give you a 1x25 matrix.

Answer 4

Suppose your original matrix is A (which has 15 elements)
A = [7.0000 26.0000 6.0000 60.0000 78.5000;
1.0000 29.0000 15.0000 52.0000 74.3000;
11.0000 56.0000 8.0000 20.0000 104.3000]
Now what you need is to reshape A to become a row vector.
reshape(A,1,[]) % Here 1 means you need one row, and [] means you need is as vector
If you want column vector you may use the following
reshape(A,[],1) % this gives a column vector
However, according to your objective the following code will do the job
A = [7.0000 26.0000 6.0000 60.0000 78.5000;
1.0000 29.0000 15.0000 52.0000 74.3000;
11.0000 56.0000 8.0000 20.0000 104.3000];
reshape(A,1,[])
The output will be
ans =
7.0000 1.0000 11.0000 26.0000 29.0000 56.0000 6.0000 15.0000 8.0000 60.0000 52.0000 20.0000 78.5000 74.3000 104.3000
For detailed information, type the following in the command window
help reshape