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This commit is contained in:
Salvatore Filippone
+24
-24
@@ -72,8 +72,8 @@ call psb_hsort(x,ix,dir,flag)
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<P>
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These serial routines sort a sequence <IMG
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WIDTH="18" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img109.png"
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WIDTH="19" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img111.png"
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ALT="$X$"> into ascending or
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descending order. The argument meaning is identical for the three
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calls; the only difference is the algorithm used to accomplish the
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@@ -98,8 +98,8 @@ Specified as: an integer, real or complex array of rank 1.
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Type:<B>optional</B>.
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<BR>
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Specified as: an integer array of (at least) the same size as <IMG
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WIDTH="18" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img109.png"
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WIDTH="19" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img111.png"
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ALT="$X$">.
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</DD>
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<DT><STRONG>dir</STRONG></DT>
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@@ -122,8 +122,8 @@ default <code>psb_lsort_up_</code>.
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</DD>
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<DT><STRONG>flag</STRONG></DT>
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<DD>Whether to keep the original values in <IMG
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WIDTH="27" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img110.png"
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WIDTH="26" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img112.png"
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ALT="$IX$">.
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<BR>
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Type:<B>optional</B>.
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@@ -184,14 +184,14 @@ position as the corresponding entries in <IMG
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$flag = psb\_sort\_ovw\_idx\_$
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-->
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<IMG
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WIDTH="180" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img111.png"
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WIDTH="181" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img113.png"
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ALT="$flag = psb\_sort\_ovw\_idx\_$"> then the entries in <IMG
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WIDTH="62" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img112.png"
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WIDTH="61" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img114.png"
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ALT="$ix(1:n)$">
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where <IMG
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WIDTH="13" HEIGHT="13" ALIGN="BOTTOM" BORDER="0"
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WIDTH="13" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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SRC="img16.png"
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ALT="$n$"> is the size of <IMG
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WIDTH="13" HEIGHT="14" ALIGN="BOTTOM" BORDER="0"
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@@ -201,19 +201,19 @@ position as the corresponding entries in <IMG
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i$
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-->
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<IMG
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WIDTH="66" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img113.png"
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WIDTH="67" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img115.png"
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ALT="$ix(i) \leftarrow
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i$">; thus, upon return from the subroutine, for each
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index <IMG
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WIDTH="9" HEIGHT="17" ALIGN="BOTTOM" BORDER="0"
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SRC="img4.png"
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ALT="$i$"> we have in <IMG
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WIDTH="37" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img114.png"
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WIDTH="36" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img116.png"
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ALT="$ix(i)$"> the position that the item <IMG
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WIDTH="31" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img115.png"
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SRC="img117.png"
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ALT="$x(i)$">
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occupied in the original data sequence;
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</LI>
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@@ -221,25 +221,25 @@ i$">; thus, upon return from the subroutine, for each
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$flag = psb\_sort\_keep\_idx\_$
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-->
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<IMG
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WIDTH="185" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img116.png"
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WIDTH="184" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
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SRC="img118.png"
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ALT="$flag = psb\_sort\_keep\_idx\_$"> the routine will assume that
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the entries in <IMG
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WIDTH="35" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img117.png"
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WIDTH="36" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img119.png"
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ALT="$ix(:)$"> have already been initialized by the user;
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</LI>
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<LI>The three sorting algorithms have a similar <IMG
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WIDTH="74" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img118.png"
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SRC="img120.png"
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ALT="$O(n \log n)$"> expected
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running time; in the average case quicksort will be the
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fastest and merge-sort the slowest. However note that:
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<OL>
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<LI>The worst case running time for quicksort is <IMG
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WIDTH="45" HEIGHT="34" ALIGN="MIDDLE" BORDER="0"
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SRC="img119.png"
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WIDTH="46" HEIGHT="34" ALIGN="MIDDLE" BORDER="0"
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SRC="img121.png"
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ALT="$O(n^2)$">; the algorithm
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implemented here follows the well-known median-of-three heuristics,
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but the worst case may still apply;
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@@ -247,7 +247,7 @@ i$">; thus, upon return from the subroutine, for each
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<LI>The worst case running time for merge-sort and heap-sort is
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<IMG
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WIDTH="74" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
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SRC="img118.png"
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SRC="img120.png"
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ALT="$O(n \log n)$"> as the average case;
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</LI>
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<LI>The merge-sort algorithm is implemented to take advantage of
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