problem in converting a matrix of integers to vector of integers using str2num and num2str

Hello,

I have a matrix x of this form (these are example values)

    1 0 0 1 0
    0 1 0 0 0
    0 0 0 0 1
    1 0 0 1 1

I am trying to make a number out of each row so I used

    y=strcat(num2str(x(:,1)),num2str(x(:,2)),num2str(x(:,3)),num2str(x(:,4)),num2str(x(:,5)));

which get me the result

'10011'
'01000'
'00001'
'10011'

Now I want to convert each string to a number but its not working.

A = str2num(y)

A =

     []

Also, I tried different method all faild beause the size of y is 4x5 and not 4x1.

why does matlab consider each char as column and how can I avoid this problem?

Thanks

Answer 1

[Ameer Hamza]

Try this

x = [
    1 0 0 1 0
    0 1 0 0 0
    0 0 0 0 1
    1 0 0 1 1];

x = char(x+'0');
y = str2num(x)

Result

>> y
y =
       10010
        1000
           1
       10011

Or a faster solution

x = [
    1 0 0 1 0
    0 1 0 0 0
    0 0 0 0 1
    1 0 0 1 1];

y = x*10.^(size(x,2)-1:-1:0)';

[Nora Khaled]

x = char(x+'0');
y = str2num(x)

this works with this sample data (which are the first 4 row)... but I also have some data in x like:

     5     0     0    90     5
     5     0     0    95     0

and it does not work because of the two digits number. is there a way a round this?

[Nora Khaled]

The second method works. Thank you!

[Ameer Hamza]

Is your expected output for this matrix is

50905
50950

or

500905
500950

[Nora Khaled]

it should be

500905
500950

its ok if some rows has 6 numbers and some has 5,right?

[Ameer Hamza]

If you want a different number of elements in each row, then string datatype is more appropriate. For example

x = [
    1 0 0 1 0
    0 1 0 0 0
    0 0 0 0 1
    1 0 0 1 1
    5 0 0 90 5
    5 0 0 95 0];

y = mat2cell(string(x), 6, ones(1,size(x,2)));
y = strcat(y{:});

output

>> y
y = 
  6×1 string array
    "10010"
    "01000"
    "00001"
    "10011"
    "500905"
    "500950"

[Nora Khaled]

Okay. Thank you very much this helps!