Convert array to string in MATLAB?

Question

I have a vector a = [1 2 3 4 5] how would I make it so b = '12345'?

I have tried b = num2str(a) but it outputs 1 2 3 4 5.

Luis Mendo · Accepted Answer · 2014-11-16 02:53:33Z

4

You can specify the format in num2str, much as you would in C's function sprintf:

b = num2str(a,'%i');

Or use sprintf:

b = sprintf('%i',a);

If a contains only single-digit numbers, you can also convert to char directly:

b = char(a+'0');

answered Nov 16, 2014 at 2:53

Luis Mendo

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3 Comments

user3622258 Over a year ago

Thank you so much Luis for helping me with this, that was exactly what I was looking for. Another question I have is how would I make the first element of c have this value? Such as c(1) = 12345?

Luis Mendo Over a year ago

I understood from your question that the desired result '12345' was a string, not a number (otherwise use Shai's answer less the num2str part). So you want to assign a string to the first element of a variable c? If c has to store other strings of possibly different lengths, c should be a cell array; and you'd just do c{1} = b

user3622258 Over a year ago

Thank you Luis Mendo and Shai for your inputs. Sorry I should of been more clear with my first question as I ultimately wanted the output from the array a to be a string '12345' so I could put it into a position of another array.

Shai · Accepted Answer · 2014-11-16 06:32:45Z

1

You need to convert yor vector to a single number first (assuming all elements are in range 0..9):

a = 1:5;
num = ( 10.^((numel(a)-1):-1:0) ) * a'; %'
b = num2str( num )

You can try this code here.

answered Nov 16, 2014 at 6:32

Shai

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