Umm, transpose() doesn't return anything. Adding a return pack("C*",@out) makes it do what you want. If it doesn't for you, could you say what perl version you are using? And exactly what you are seeing? "Cries foul" isn't descriptive enough.

Update: another way: 

sub transpose {
    return if length $_[0] < $BUFSIZE;
    pack"B*",join"",(split//,unpack"B*",substr$_[0],0,$BUFSIZE)[map$_%
+$BUFSIZE*$BUFSIZE+int($_/$BUFSIZE),0..$BUFSIZE**2-1]
}

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Just as background, in case it helps with your problem, note that perl's bitops have two different modes, numeric (where the scalar operands are numbers) and bitwise, where the operands are strings and the operation is done on each bit of each character. The numeric mode is triggered whenever either of the operands was set to a number or has been used in a numeric context. For example, 3|8 is 11, but "3"|"8" is ";". You can force one or the other regardless of where a scalar's been by replacing one of the operands, say $x, with (0+$x) to force numeric mode, or stringize both, so $x^$y becomes "$x"^"$y", to force bitwise mode. See perlop for more info.

In reply to Re: perl bit matrix transposition / weak typing problem by ysth
in thread perl bit matrix transposition / weak typing problem by infi

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