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<H2><A NAME="SECTION03517000000000000000"></A><A NAME="subsecworkspace"></A>
<BR>
Work Arrays
</H2>
<P>
Many LAPACK routines require one or more work
arrays<A NAME="19554"></A> to be passed as
arguments. The name of a work array is usually WORK -- sometimes
IWORK, RWORK or BWORK to distinguish work arrays of
integer, real or logical (Boolean) type.
<P>
Occasionally the first element of a work array is used to return some
useful information: in such cases, the argument is described as
(workspace/output) instead of simply (workspace).
<P>
A number of routines implementing block algorithms require workspace
sufficient to hold one block of rows or columns of the matrix,
for example, workspace
of size <B><I>n</I></B>-by-<B><I>nb</I></B>, where <B><I>nb</I></B> is the block size.
In such cases, the actual declared length of the work array
must be passed as a separate argument LWORK<A NAME="19555"></A>,
which immediately follows WORK in the argument-list.
<P>
See Section <A HREF="node120.html#secblocksize">5.2</A> for further explanation.
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<ADDRESS>
<I>Susan Blackford</I>
<BR><I>1999-10-01</I>
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