Re: transform a string with variable length to a matrix

[David Bateman]

Goebel, Juergen wrote:
> 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.
>
> I'm sure some wizard can tell me what I have to do ...
>
> Regards,
>
> Jürgen
>
> ------------------------------------------------------------------------
>
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>   
The de2bi function in the communications toolbox does what you want.. 
The advantage is that it handles matrices for speed. For example

octave:1> de2bi(0:15)
ans =

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

octave:2> de2bi([0:15],"left-msb")
ans =

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


D.


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