Combine columns into a single number per row - matlab

Question

I need to combine each column in a row into a single number
A = [8 1 6
3 5 7
4 9 2];
My goal is to have this form:
B = [816; 357; 492]

Answer 1

There are a few ways that you can do this. The fastest is likely to consider that each row of your matrix contains digits in base-10 and to combine these digits together we should multiply the first column by 10^2 (100), the second column by 10^1 (10) and the third column by 10^0 (1) and then sum across each row.
We can easily accomplish that with this one-liner which constructs all the powers of 10, and then performs matrix multiplication with A to perform the multiplication and summation.
A = [8 1 6; 3 5 7; 4 9 2];
B = A * flip(10.^(0:size(A, 2)-1))';
% 816
% 357
% 492
Another slower but possible solution would be to convert your rows to a string and then convert the string back to a number.
B = str2double(reshape(sprintf('%d', A), size(A, 2), []));

Answer 2

#Suever: I don't understand why did you delete the discussion, I am new in this group; any way, i put all the tests that i did and the result:
`function testtttt ()
%%%% Solution1 stackoverflow %%%%
%A=importdata('file.mat');
%B= (A * flip(10.^(0:size(A, 2)-1))')
%Result: B =
% 2.1194e+17
% 2.4989e+17
% 3.5458e+16
% 2.3669e+17
% 1.7582e+17
%%%%%%%%% Solution2 Matlab Forum %%%%%%%%%%%
% A=importdata('file.mat');
% B= num2str (A * flip(10.^(0:size(A, 2)-1))')
%Result: B =
% 211935227421357568
% 249886223928308032
% 35457727150655748
% 236691335688358080
% 175820284169194336
%%%%%%%%% Solution3 Matlab Forum %%%%%%%%%%%
% A=importdata('file.mat');
% B= dec2hex(str2num(strcat(num2str(A)')'))
%Result: B =
% D0
% E7
% 20
% E9
% A1
% 18
% 47
% 8C
% F5
% F7
% 28
% F8
.....
%%%%%%%%% Solution4 Matlab Forum %%%%%%%%%%%
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
%Result: B =
{
[1,1] =
208 15 217 252 128 35 50 252 209 120 97 140 235 220 32 251
[1,2] =
231 174 143 43 125 66 49 143 48 139 81 103 154 229 93 229
[1,3] =
32 10 237 65 224 22 83 238 31 15 252 27 179 48 173 221
[1,4] =
233 18 178 101 90 109 225 184 210 168 183 185 190 169 96 205
[1,5] =
161 133 149 18 115 65 120 123 163 227 105 157 98 240 221 142
........
endfunction `
the best solution is the third that i found in matlab forum. Then the result found in solution 2 are caused by the using of octave. Thank you for your help.