46 lines
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46 lines
4.5 KiB
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<!-- Common Lisp HyperSpec (TM), version 7.0 generated by Kent M. Pitman on Mon, 11-Apr-2005 2:31am EDT -->
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<TITLE>CLHS: Section 2.4.8.12</TITLE>
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<H1><A REV=MADE HREF="http://www.lispworks.com/"><IMG WIDTH=80 HEIGHT=65 ALT="[LISPWORKS]" SRC="../Graphics/LWSmall.gif" ALIGN=Bottom></A><A REL=TOP HREF="../Front/index.htm"><IMG WIDTH=237 HEIGHT=65 ALT="[Common Lisp HyperSpec (TM)]" SRC="../Graphics/CLHS_Sm.gif" ALIGN=Bottom></A> <A REL=PREV HREF="02_dhk.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Previous]" SRC="../Graphics/Prev.gif" ALIGN=Bottom></A><A REL=UP HREF="02_dh.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Up]" SRC="../Graphics/Up.gif" ALIGN=Bottom></A><A REL=NEXT HREF="02_dhm.htm"><IMG WIDTH=40 HEIGHT=40 ALT="[Next]" SRC="../Graphics/Next.gif" ALIGN=Bottom></A></H1>
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<H2>
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2.4.8.12 Sharpsign A</H2> <P>
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<TT>#</TT><I>n</I><TT>A</TT> <P>
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<TT>#</TT><I>n</I><TT>A</TT><I>object</I><TT></TT> constructs an <I>n</I>-dimensional <A REL=DEFINITION HREF="26_glo_a.htm#array"><I>array</I></A>, using <I>object</I> as the value of the <TT>:initial-contents</TT> argument to <A REL=DEFINITION HREF="f_mk_ar.htm#make-array"><B>make-array</B></A>. <P>
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For example, <TT>#2A((0 1 5) (foo 2 (hot dog)))</TT> represents a 2-by-3 matrix: <P>
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<PRE>
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0 1 5
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foo 2 (hot dog)
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</PRE>
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</TT> In contrast, <TT>#1A((0 1 5) (foo 2 (hot dog)))</TT> represents a <A REL=DEFINITION HREF="26_glo_v.htm#vector"><I>vector</I></A> of <A REL=DEFINITION HREF="26_glo_l.htm#length"><I>length</I></A> <TT>2</TT> whose <A REL=DEFINITION HREF="26_glo_e.htm#element"><I>elements</I></A> are <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>lists</I></A>: <P>
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<PRE>
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(0 1 5) (foo 2 (hot dog))
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</PRE>
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</TT> <TT>#0A((0 1 5) (foo 2 (hot dog)))</TT> represents a zero-dimensional <A REL=DEFINITION HREF="26_glo_a.htm#array"><I>array</I></A> whose sole element is a <A REL=DEFINITION HREF="26_glo_l.htm#list"><I>list</I></A>: <P>
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<PRE>
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((0 1 5) (foo 2 (hot dog)))
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</PRE>
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</TT> <TT>#0A foo</TT> represents a zero-dimensional <A REL=DEFINITION HREF="26_glo_a.htm#array"><I>array</I></A> whose sole element is the <A REL=DEFINITION HREF="26_glo_s.htm#symbol"><I>symbol</I></A> <TT>foo</TT>. The notation <TT>#1A foo</TT> is not valid because <TT>foo</TT> is not a <A REL=DEFINITION HREF="26_glo_s.htm#sequence"><I>sequence</I></A>. <P>
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If some <A REL=DEFINITION HREF="26_glo_d.htm#dimension"><I>dimension</I></A> of the <A REL=DEFINITION HREF="26_glo_a.htm#array"><I>array</I></A> whose representation is being parsed is found to be <TT>0</TT>, all <A REL=DEFINITION HREF="26_glo_d.htm#dimension"><I>dimensions</I></A> to the right (i.e., the higher numbered <A REL=DEFINITION HREF="26_glo_d.htm#dimension"><I>dimensions</I></A>) are also considered to be <TT>0</TT>. <P>
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For information on how the <A REL=DEFINITION HREF="26_glo_l.htm#lisp_printer"><I>Lisp printer</I></A> prints <A REL=DEFINITION HREF="26_glo_a.htm#array"><I>arrays</I></A>, see <A REL=CHILD HREF="22_acd.htm">Section 22.1.3.4 (Printing Strings)</A>, <A REL=CHILD HREF="22_acf.htm">Section 22.1.3.6 (Printing Bit Vectors)</A>, <A REL=CHILD HREF="22_acg.htm">Section 22.1.3.7 (Printing Other Vectors)</A>, or <A REL=CHILD HREF="22_ach.htm">Section 22.1.3.8 (Printing Other Arrays)</A>. <P>
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<A REL=COPYRIGHT HREF="../Front/Help.htm#Legal"><I>Copyright 1996-2005, LispWorks Ltd. All rights reserved.</I></A><P>
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