Hi

I'm not often working with vec , pack and unpack but whats the way to display a 16 bit-vector with MSB to the left?

 
  DB<138> undef $m0; vec($m0,$_,1)=1 for  0,2,8,9,10

  DB<139> p unpack('b16', $m0)                    # ok LSB left
1010000011100000
  DB<140> p unpack('B16', $m0)                    # MSB, but inside LS
+ bytes chunks
0000010100000111
  DB<142> $x+= 2**$_ for  0,2,8,9,10

  DB<144> printf "%016b",$x                      # what I expected
0000011100000101
  DB<145>

[download]

update

well it's documented 

   B  A bit string (descending bit order inside each byte).

[download]

but there must be a better way than

  DB<184> p reverse unpack ('B8B8',$m0)
0000011100000101
  DB<185>

[download]

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

In reply to Displaying bit-vectors with Most Significant Bits to the left? by LanX

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.