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<H2><A NAME="SECTION04312000000000000000">Data Types and Precision</A></H2>
<P>
ScaLAPACK provides the same range of functionality for <B>real</B>
and <B>complex</B> data, with a few exceptions.
The complex Hermitian eigensolver (PCHEEV)
and complex singular value decomposition (PCGESVD)
are still under development.  They may be available in a future release
of ScaLAPACK.
<P>
Matching routines for real and complex data have been coded
to maintain a close correspondence between the two, wherever possible.
However, there are cases where the corresponding complex version calling
sequence has more arguments than the real version.
<P>
All routines in ScaLAPACK are provided in both <B>single</B>- and 
<B>double</B>-precision versions.
<P>
Double-precision routines for complex matrices require the 
nonstandard Fortran 77 data type COMPLEX*16, which is available on
most machines where double precision computation is usual.
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<BR> <HR>
<P><ADDRESS>
<I>Susan Blackford <BR>
Tue May 13 09:21:01 EDT 1997</I>
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