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<H2><A NAME="SECTION000470000000000000000">SLA_DVN - Normalize Vector</A>
<A NAME="xref_SLA_DVN"> </A><A NAME="SLA_DVN"> </A>
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<DL>
<DT><STRONG>ACTION:</STRONG>
<DD>Normalize a 3-vector, also giving the modulus (double precision).
<DT><STRONG>CALL:</STRONG>
<DD><TT>CALL sla_DVN (V, UV, VM)</TT>
<P> </DL>
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<DT><STRONG>GIVEN:</STRONG>
<DD>
<BR>
<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>V</EM></TD>
<TH ALIGN="LEFT"><B>D(3)</B></TH>
<TD ALIGN="LEFT" NOWRAP>vector</TD>
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<DT><STRONG>RETURNED:</STRONG>
<DD>
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<TABLE CELLPADDING=3>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>UV</EM></TD>
<TH ALIGN="LEFT"><B>D(3)</B></TH>
<TD ALIGN="LEFT" NOWRAP>unit vector in direction of V</TD>
</TR>
<TR VALIGN="TOP"><TD ALIGN="LEFT"><EM>VM</EM></TD>
<TD ALIGN="LEFT"><B>D</B></TD>
<TD ALIGN="LEFT" NOWRAP>modulus of V</TD>
</TR>
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<DT><STRONG>NOTE:</STRONG>
<DD>If the modulus of V is zero, UV is set to zero as well.
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<ADDRESS>
<I>SLALIB --- Positional Astronomy Library<BR>Starlink User Note 67<BR>P. T. Wallace<BR>12 October 1999<BR>E-mail:ptw@star.rl.ac.uk</I>
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