Re: transform a string with variable length to a matrix

[Benjamin Lindner]

> Hi,
>
> Using dec2bin I transform a decimal number to a binary number
> with an a priori unknown number of digits. But the next step
> offers a little problem for me: I have to transform the resulting
> string to a matrix of ones and zeros. Trying a bit with str2mat
> like str2mat([a(1);a(2);a(3)] wasn't successful 'cause the
> number of digits is variable.

If I interpret your problem correctly, then you want to transfer a 
number into a vector containing the binary representation.
You can do this without the intermediate string conversion by

  A = 9;
  Nbits = ceil(log2(A));
  bitmap = uint32( 2.^[0:Nbits-1] );
  M = double(bitand(A,bitmap) ~= 0);

this will yield the 1x4 matrix M
  M = 1 0 0 1


Benjamin Lindner