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>array-row-major-index | Common Lisp Nova Spec</TITLE
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>Common Lisp Nova Spec</A
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>→ <A HREF="f_array-row-major-index.html"
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>array-row-major-index</A
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><TD ALIGN="LEFT" VALIGN="BASELINE" WIDTH="100%" CLASS="name"
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><SPAN CLASS="idx" DATA-KIND="idxref" DATA-TERM="array-row-major-index"
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><B
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>array-row-major-index</B
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></TD
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><TD ALIGN="RIGHT" VALIGN="BASELINE" WIDTH="0" NOWRAP="NOWRAP" CLASS="ftype"
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><I
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>Function</I
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><UL CLASS="subtoc"
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><DL
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><DT
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><B
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>Syntax</B
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></DT
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><DD
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><P CLASS="j"
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><B
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>array-row-major-index</B
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> <SPAN CLASS="cmssi"
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>array</SPAN
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> <SPAN CLASS="cmtt"
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>&rest</SPAN
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> <SPAN CLASS="cmssi"
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>subscripts</SPAN
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> <SPAN CLASS="arrow"
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>→</SPAN
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> <SPAN CLASS="cmssi"
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>index</SPAN
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></P
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></DD
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><DT
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><B
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>Arguments and Values</B
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></DT
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><DD
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><P CLASS="j"
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><VAR CLASS="param"
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>array</VAR
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> — an <A HREF="26_1_Glossary.html#array"
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><EM CLASS="term"
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>array</EM
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></A
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>subscripts</VAR
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> — a <A HREF="26_1_Glossary.html#list"
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><EM CLASS="term"
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>list</EM
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></A
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> of <A HREF="26_1_Glossary.html#valid_array_index"
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><EM CLASS="term"
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>valid array indices</EM
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></A
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> for the <VAR CLASS="param"
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>array</VAR
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>. </P
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><P CLASS="j"
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><VAR CLASS="param"
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>index</VAR
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> — a <A HREF="26_1_Glossary.html#valid_array_row-major_index"
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><EM CLASS="term"
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>valid array row-major index</EM
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></A
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> for the <VAR CLASS="param"
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>array</VAR
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>.</P
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></DD
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><DT
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><B
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>Description</B
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></DT
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><DD
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><P CLASS="j"
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>Computes the position according to the row-major ordering of <VAR CLASS="param"
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>array</VAR
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> for the element that is specified by <VAR CLASS="param"
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>subscripts</VAR
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>, and returns the offset of the element in the computed position from the beginning of <VAR CLASS="param"
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>array</VAR
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>. </P
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><P CLASS="j"
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>For a one-dimensional <VAR CLASS="param"
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>array</VAR
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>, the result of <A HREF="f_array-row-major-index.html" CLASS="funref"
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><B
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>array-row-major-index</B
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></A
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> equals <VAR CLASS="param"
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>subscript</VAR
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>. </P
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><P CLASS="j"
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><A HREF="f_array-row-major-index.html" CLASS="funref"
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><B
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>array-row-major-index</B
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></A
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> ignores <A HREF="26_1_Glossary.html#fill_pointer"
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><EM CLASS="term"
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>fill pointers</EM
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></A
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>.</P
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></DD
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><DT
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><B
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>Examples</B
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></DT
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><DD
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><PRE CLASS="screen"
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>(setq a (make-array '(4 7) :element-type '(unsigned-byte 8)))
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(array-row-major-index a 1 2) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 9
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(array-row-major-index
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(make-array '(2 3 4)
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:element-type '(unsigned-byte 8)
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:displaced-to a
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:displaced-index-offset 4)
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0 2 1) <SPAN CLASS="cmsy"
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><SPAN CLASS="arrow"
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>→</SPAN
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></SPAN
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> 9</PRE
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></DD
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><DT
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><B
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>Notes</B
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></DT
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><DD
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><P CLASS="j"
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>A possible definition of <A HREF="f_array-row-major-index.html" CLASS="funref"
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><B
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>array-row-major-index</B
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></A
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>, with no error-checking, is</P
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><PRE CLASS="screen"
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>(defun array-row-major-index (a &rest subscripts)
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(apply #'+ (maplist #'(lambda (x y)
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(* (car x) (apply #'* (cdr y))))
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subscripts
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(array-dimensions a))))</PRE
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></DD
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>Conversion to HTML copyright 2023 by Gilbert Baumann</DIV
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