join numbers in vector

I have a row vector with 7 numbers, e.g. 13 30 44 12 44 23 12. I want to join all these numbers into a single number, or 13304412442312. I have not been able to find a method to do this. Can anyone please suggest a method to do this without using a for loop.

Answer 1

[kjetil87]

x=[13 30 44 12 44 23 12];
stringX=num2str(x);
stringX=stringX(stringX~=' '); % remove the space
x2=str2num(stringX);

[dpb]

Can avoid the need to strip out spaces by using

sprintf('%d',x)

For the specific case x is 14 decimal digits and will fit into a double; add another and will need a longer mantissa or will lose precision.

>> v=[52 v]
v =
  52    13    30    44    12    44    23    12    15
>> sscanf(sprintf('%d',v),'%li')==str2num(sprintf('%d',v))
ans =
   0
>>

Hence my earlier suggestion to use %li and sscanf() to get a 64-bit integer.

[kjetil87]

agreed , int64 is better.

[dpb]

Gives more dynamic range than double at cost of less flexible to other operations. Of course, OP will eventually run out of range there, too, if continues to increase the size of the vector...

Answer 2

[Azzi Abdelmalek]

a=[13 30 44 12 44 23 12]
b=strrep(num2str(a),' ','')

% This is a string, if you to get a number

b=str2num(strrep(num2str(a),' ',''))

Answer 3

[dpb]

>> sscanf(sprintf('%d',v),'%lu')
ans =
     13304412442312
>> whos ans
Name      Size            Bytes  Class     Attributes

ans       1x1                 8  uint64              

>> sscanf(sprintf('%d',v),'%li')
ans =
     13304412442312
>> whos ans
Name      Size            Bytes  Class    Attributes

ans       1x1                 8  int64

>>