📄 m35 - processing variables with arrays - 33 of 35.mht
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<H2><STRONG><A name=3DText>Text Summary</A></STRONG> </H2>
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<P><STRONG>Purpose of SAS Arrays</STRONG><BR>An array is a =
temporary=20
grouping of variables under a <A=20
onmouseover=3D"window.status=3D'Display details on the use of =
arrays.'; "=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
href=3D"http://www.sas.com/apps/OLTRN/59080/m35/m35_2.htm">single =
name</A>.=20
This can reduce the number of statements needed to process =
variables and=20
can simplify the maintenance of DATA step programs. </P>
<P><STRONG>Defining an Array</STRONG><BR>To group previously =
defined data=20
set variables into an array, use an <A=20
onmouseover=3D"window.status=3D'Display details on defining =
arrays.';"=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
href=3D"http://www.sas.com/apps/OLTRN/59080/m35/m35_3.htm">ARRAY=20
statement</A> that specifies the array's name; its dimension =
enclosed in=20
braces, brackets, or parentheses; and the elements to include. For =
example: <NOBR><CODE><FONT color=3D#003399>array sales{4} qtr1 =
qtr2 qtr3=20
qtr4;</FONT></CODE></NOBR>=20
<P><STRONG>Variable Lists as Array Elements</STRONG><BR>You can =
use a <A=20
onmouseover=3D"window.status=3D'Display details on variable =
lists.';"=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
=
href=3D"http://www.sas.com/apps/OLTRN/59080/m35/m35_4.htm">variable =
list</A>=20
to specify array elements. Depending on the form of the variable =
list, it=20
can specify all numeric or all character variables, or a numbered =
range of=20
variables.=20
<P><STRONG>Referencing Elements of an Array</STRONG><BR>When you =
define an=20
array in a DATA step, an index value is assigned to each element. =
During=20
execution, you can use an <A=20
onmouseover=3D"window.status=3D'Display details on array =
references.'; "=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
href=3D"http://www.sas.com/apps/OLTRN/59080/m35/m35_7.htm">array=20
reference</A> to perform actions on specific array elements. When =
used in=20
a DO loop, for example, the index variable of the iterative DO =
statement=20
can reference each element of the array.=20
<P><STRONG>The DIM Function</STRONG><BR>When using DO loops to =
process=20
arrays, you can also use the <A=20
onmouseover=3D"window.status=3D'Display details on the DIM =
function.'; "=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
href=3D"http://www.sas.com/apps/OLTRN/59080/m35/m35_11.htm">DIM =
function</A>=20
to specify the TO clause of the iterative DO statement. When you =
use the=20
DIM function, you do not have to re-specify the stop value of a DO =
statement if you change the dimension of the array.=20
<P><STRONG>Creating Variables with the ARRAY =
Statement</STRONG><BR>If you=20
don't specify array elements in an ARRAY statement, SAS =
automatically <A=20
onmouseover=3D"window.status=3D'Display details on creating =
variables.';"=20
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