blitz_7.html

c++经典教材 Blitz++ v0.8

at the end of the data.
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>T_numtype* [restrict]                       data();
const T_numtype* [restrict]                 data() const;
</pre></td></tr></table>Returns a pointer to the first element in the vector.
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>int                                         length() const;
</pre></td></tr></table>Returns the length of the vector (the template parameter <CODE>N</CODE>).
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>T_numtype                                   operator()(int i) const;
T_numtype&#38;                                  operator()(int i);
T_numtype                                   operator[](int i) const;
T_numtype&#38;                                  operator[](int i);
</pre></td></tr></table>Returns the <CODE>i</CODE>th element of the vector.  If the code is compiled with
debugging enabled (<CODE>-DBZ_DEBUG</CODE>), bounds checking is performed.
</P><P>

<HR SIZE="6">
<A NAME="SEC129"></A>
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC128"> &lt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC130"> &gt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC130"> &lt;&lt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC125"> Up </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC134"> &gt;&gt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz.html#SEC_Top">Top</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_toc.html#SEC_Contents">Contents</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_abt.html#SEC_About"> ? </A>]</TD>
</TR></TABLE>
<H2> 7.4 Assignment operators </H2>
<!--docid::SEC129::-->
<P>

The assignment operators =, +=, -=, *=, /=, %=, ^=, &#38;=, |=, &#62;&#62;= and &#60;&#60;= are
all provided.  The right hand side of an assignment may be a scalar of type
<CODE>T_numtype</CODE>, a <CODE>TinyVector</CODE> of any type but the same size, or a
vector expression.
</P><P>

<HR SIZE="6">
<A NAME="SEC130"></A>
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC129"> &lt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC131"> &gt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC131"> &lt;&lt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC125"> Up </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC134"> &gt;&gt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz.html#SEC_Top">Top</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_toc.html#SEC_Contents">Contents</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_abt.html#SEC_About"> ? </A>]</TD>
</TR></TABLE>
<H2> 7.5 Expressions </H2>
<!--docid::SEC130::-->
<P>

Expressions involving tiny vectors may contain any combination
of the operators
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>+ - * / % ^ &#38; | &#62;&#62; &#60;&#60;
</pre></td></tr></table></P><P>

with operands of type TinyVector, scalar, or vector expressions.
The usual math functions (see the Array documentation) are supported
on TinyVector.
</P><P>

<HR SIZE="6">
<A NAME="SEC131"></A>
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC130"> &lt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC132"> &gt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC132"> &lt;&lt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC125"> Up </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC134"> &gt;&gt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz.html#SEC_Top">Top</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_toc.html#SEC_Contents">Contents</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_abt.html#SEC_About"> ? </A>]</TD>
</TR></TABLE>
<H2> 7.6 Global functions </H2>
<!--docid::SEC131::-->
<P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>dot(TinyVector, TinyVector);
dot(vector-expr, TinyVector);
dot(TinyVector, vector-expr);
dot(vector-expr, vector-expr);
</pre></td></tr></table>These functions calculate a dot product between <CODE>TinyVector</CODE>s
(or vector expressions).  The result is a scalar; the type
of the scalar follows the usual type promotion rules.
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>product(TinyVector);
</pre></td></tr></table>Returns the product of all the elements in the vector.
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>sum(TinyVector);
</pre></td></tr></table>Returns the sum of the elements in the vector.
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>TinyVector&#60;T,3&#62; cross(TinyVector&#60;T,3&#62; x, TinyVector&#60;T,3&#62; y);
</pre></td></tr></table>Returns the cross product of <CODE>x</CODE> and <CODE>y</CODE>.
</P><P>

<HR SIZE="6">
<A NAME="SEC132"></A>
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC131"> &lt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC133"> &gt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC133"> &lt;&lt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC125"> Up </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC134"> &gt;&gt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz.html#SEC_Top">Top</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_toc.html#SEC_Contents">Contents</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_abt.html#SEC_About"> ? </A>]</TD>
</TR></TABLE>
<H2> 7.7 Arrays of <CODE>TinyVector</CODE> </H2>
<!--docid::SEC132::-->
<P>

<HR SIZE="6">
<A NAME="SEC133"></A>
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC132"> &lt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC134"> &gt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC125"> &lt;&lt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC125"> Up </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC134"> &gt;&gt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz.html#SEC_Top">Top</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_toc.html#SEC_Contents">Contents</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_abt.html#SEC_About"> ? </A>]</TD>
</TR></TABLE>
<H2> 7.8 Input/output </H2>
<!--docid::SEC133::-->
<P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>ostream&#38; operator&#60;&#60;(ostream&#38;, const TinyVector&#60;T,N&#62;&#38; x);
</pre></td></tr></table>This function outputs a <CODE>TinyVector</CODE> onto a stream.  Here's
an illustration of the format for a length 3 vector:
</P><P>

<TABLE><tr><td>&nbsp;</td><td class=example><pre>[        0.5       0.2       0.9 ]
</pre></td></tr></table></P><P>

<A NAME="Parallel Computing"></A>
<HR SIZE="6">
<TABLE CELLPADDING=1 CELLSPACING=1 BORDER=0>
<TR><TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_7.html#SEC125"> &lt;&lt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_8.html#SEC134"> &gt;&gt; </A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT"> &nbsp; <TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz.html#SEC_Top">Top</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_toc.html#SEC_Contents">Contents</A>]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[Index]</TD>
<TD VALIGN="MIDDLE" ALIGN="LEFT">[<A HREF="blitz_abt.html#SEC_About"> ? </A>]</TD>
</TR></TABLE>
<BR>  
<FONT SIZE="-1">
This document was generated
by <I>Julian Cummings</I> on <I>November, 4  2004</I>
using <A HREF="http://www.mathematik.uni-kl.de/~obachman/Texi2html
"><I>texi2html</I></A>

</BODY>
</HTML>