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<H2><A NAME="s7">7.</A> <A HREF="slshfun.html#toc7">Array Functions</A></H2>

S-Lang includes many intrinsic functions that operate on arrays. The
additional functions described here are defined in
<CODE>arrayfuns.sl</CODE>.

<H2><A NAME="rearrange"></A> <A NAME="ss7.1">7.1</A> <A HREF="slshfun.html#toc7.1">rearrange</A>
</H2>

<DL>
<DT> Synopsis <DD>
Rearrange the elements of a 1-d array or list.
<DT> Usage <DD>
<CODE>rearrange (A, indices)</CODE>
<DT> Description <DD>
This function performs an in-place rearrangment of the the elements
of an array according to the specified permutation, represented by
the <CODE>indices</CODE> argument. The <CODE>indices</CODE> array is assumed to
contain unique integers in the range <CODE>[0,length(A)-1]</CODE>.
<DT> Notes <DD>
The function modifies the elements of the <CODE>indices</CODE> array while
it performs the rearrangement. The values will get restored upon
return from function.
The algorithm used was derived from the DPPERM function, which is
part of the SLATEC package. See
<A HREF="http://gams.nist.gov/cgi-bin/serve.cgi/Package/SLATEC">http://gams.nist.gov/cgi-bin/serve.cgi/Package/SLATEC</A>.
<DT> See Also <DD>
<CODE>array_reverse, array_swap</CODE>
</DL>

<H2><A NAME="reverse"></A> <A NAME="ss7.2">7.2</A> <A HREF="slshfun.html#toc7.2">reverse</A>
</H2>

<DL>
<DT> Synopsis <DD>
Reverse the elements of a 1-d array
<DT> Usage <DD>
<CODE>Array_Type reverse (Array_Type A)</CODE>
<DT> Description <DD>
The <CODE>reverse</CODE> function reverses the elements of a 1-d array and
returns the result.
<DT> See Also <DD>
<CODE>shift</CODE>
</DL>

<H2><A NAME="shift"></A> <A NAME="ss7.3">7.3</A> <A HREF="slshfun.html#toc7.3">shift</A>
</H2>

<DL>
<DT> Synopsis <DD>
Shift the elements of a 1-d array
<DT> Usage <DD>
<CODE>Array_Type shift (Array_Type A, Int_Type n)</CODE>
<DT> Description <DD>
The <CODE>shift</CODE> function shifts the elements of an array by a specified amount
and returns the result. If <CODE>n</CODE> is positive, the ith element of the array
will be shifted to the position <CODE>i-n</CODE> of the array. Elements for
which <CODE>i-n</CODE> is less than 0 will be moved to the end of the array.
<DT> Example <DD>

<BLOCKQUOTE><CODE>
<PRE>
 A = [1,2,3,4,5,6,7,8,9];
 B = shift (A, 3); % ==&gt; B = [4,5,6,7,8,9,1,2,3];
 C = shift (A, -1); % ==&gt; C = [9,1,2,3,4,5,6,7,8];
</PRE>
</CODE></BLOCKQUOTE>

<DT> Notes <DD>
It many ways <CODE>rotate</CODE> would be a better name for this function.
<DT> See Also <DD>
<CODE>reverse, transpose</CODE>
</DL>

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