How do I concatenate cells in each row in a matrix?

Dear Matlab users,

I need to cancat each row's cell in a matrix, For example: I have this matrix:

                     8 1 6 
                     3 5 7 
                     4 9 2

My goal is to have this form: 816, 357, 492.

I am beginner with matlab. I would be very grateful if you could help me. Thanks in advance.

[Stephen23]

"My goal is to have this form: 816, 357, 492."

Can you please explain what you want: is this three numbers with values 816, 357, and 492, or three separate vector of integers {[8,1,6],[3,5,7],[4,9,2]}, or is this three strings {'816','357','492'}, or something else entirely?

Your description is not very clear what you want the output to be.

Answer 1

[AMAL targhi]

a  = [ 8 1 6 ; 1 2 3 ; 4 5 6 ]
 [l c ] = size (a) ;

   b =  cell (l,1);

   for i =1 : l

       b {i,: } = [ a(i,1) a(i,2) a(i,3) ] ;

   end

[Guillaume]

I doubt it's what the OP was asking, but in any case, the above can be achieved a lot more simply (and reliably since it makes no assumption on the number of columns) with just one line:

b = num2cell(a, 2);

Furthermore, the expression

b{i,: } = [ a(i,1) a(i,2) a(i,3) ]

is the same as

b{i} = a(i, [1:3]);  %however b{i} = a(i, :) would make more sense

Note that since you declared b with just one column, the : in b{i, :} is just 1 and can just as well be omitted.

[MS]

Dear users, I tried you last solutions:

a  = importdata('file.mat') % file.mat contains my matrix
 [l c ] = size (a) 
   b =  cell (l,1)
   for i =1 : l
       b{i} = a(i, [1:16]);  %however b{i} = a(i, :)
   end

I got this solution:

 b =
  {
    [1,1] = [](0x0)
    [2,1] = [](0x0)
    [3,1] = [](0x0)
    [4,1] = [](0x0)
    [5,1] = [](0x0)
    [6,1] = [](0x0)
    [7,1] = [](0x0)
    [8,1] = [](0x0)
    [9,1] = [](0x0)
    [10,1] = [](0x0)
    [11,1] = [](0x0)
    [12,1] = [](0x0)
    [13,1] = [](0x0)
    [14,1] = [](0x0)
    [15,1] = [](0x0)
    [16,1] = [](0x0)
    [17,1] = [](0x0)
    .....
But my problem is that i don't understand the result, what does it mean  [](0x0)?
Thank you very much for your help.

[Guillaume]

Why did you accept the answer if it does not work for you?

I'm not sure what you've done. The output you're showing does not appear to be something that matlab could produce. In any case, as per my comment, the theoretical output of the above code can be achieved more simply with:

a = importdata('file.mat');
b = num2cell(a, 2);

Also as per my comment, I doubt that's what you're asking for.

[MS]

I am so sorry, it is the first time that i use this forum.

[Stephen23]

@Guillaume: Octave produces that output.

@Smache Meriem: You should only accept an answer when it resolves your question.

[MS]

@Stephen: yes sir, exactly i use octave, for that i am not sur about the solution that i have.

[MS]

@Guillaume and @ AMAL targhi thank you very much for your help.

Answer 2

[Andrei Bobrov]

num2cell(a,2)

[MS]

Thank you very much for your help, however sir the size of my matrix id 100*16:

208    15   217   252   128    35    50   252   209   120    97   140   235   220    32   251
     231   174   143    43   125    66    49   143    48   139    81   103   154   229    93   229
      32    10   237    65   224    22    83   238    31    15   252    27   179    48   173   221
     233    18   178   101    90   109   225   184   210   168   183   185   190   169    96   205
     161   133   149    18   115    65   120   123   163   227   105   157    98   240   221   142
      24    24   208   175   246    76   103   163     4    28.........

So by trying your method i have this result: operator *: nonconformant arguments (op1 is 100x16, op2 is 3x1) I would be very grateful sir if you could help me. Thanks in advance.