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<P>Dear Dr. Tsjerk:</P>
<P> </P>
<P>Firstly, sorry to occupy you so much time to deal with my questions, thanks
again.</P>
<P> </P>
<P>But, I do not know why you always mentioned about a hexagonal prism and why I
need to make such a transformation from parallelogram to hexagon.</P>
<P> </P>
<P>The box I need is only a parallelogram one. As a fact, I can get such a box
through defining "angles=90 90 120" in editconf command, and a parallelogram
shape box can be seen by trjconv. So, I can not understand why hexagon is always
mentioned?</P>
<P> </P>
<P>Thanks and regards,</P>
<P> </P>
<P>Yinghong</P>
<P>Hong Kong University</P>
<P> </P>
<P>>You just don't get it... Now find and read the paper of Bekker and do
the<BR>>excercise from the previous mail. The answers are:<BR><BR>>1. Your
parallelogram can be transformed to a single hexagonal prism with<BR>>exactly
the same lattice vectors, volume and content. One to one.<BR><BR>>2. I think
that when setting the box with -vectors and -angles, -bt tric
is<BR>>implicit, but it doesn't hurt
anyway.<BR><BR>>Tsjerk<BR></P></BODY></HTML>