control_systems_torbox 0.2.1

Control systems toolbox
Documentation 
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<HTML>
<HEAD><TITLE>UE01MD - SLICOT Library Routine Documentation</TITLE>
</HEAD>
<BODY>

<H2><A Name="UE01MD">UE01MD</A></H2>
<H3>
Default machine-specific parameters for (skew-)Hamiltonian computation routines
</H3>
<A HREF ="#Specification"><B>[Specification]</B></A>
<A HREF ="#Arguments"><B>[Arguments]</B></A>
<A HREF ="#Method"><B>[Method]</B></A>
<A HREF ="#References"><B>[References]</B></A>
<A HREF ="#Comments"><B>[Comments]</B></A>
<A HREF ="#Example"><B>[Example]</B></A>

<P>
<B><FONT SIZE="+1">Purpose</FONT></B>
<PRE>
  To provide an extension of the LAPACK routine ILAENV to
  machine-specific parameters for SLICOT routines.

  The default values in this version aim to give good performance on
  a wide range of computers. For optimal performance, however, the
  user is advised to modify this routine. Note that an optimized
  BLAS is a crucial prerequisite for any speed gains. For further
  details, see ILAENV.

</PRE>
<A name="Specification"><B><FONT SIZE="+1">Specification</FONT></B></A>
<PRE>
      INTEGER FUNCTION UE01MD( ISPEC, NAME, OPTS, N1, N2, N3 )
C     .. Scalar Arguments ..
      CHARACTER*( * )    NAME, OPTS
      INTEGER            ISPEC, N1, N2, N3

</PRE>
<B><FONT SIZE="+1">Function Value</FONT></B>
<PRE>
  UE01MD  INTEGER
          The function value set according to ISPEC.

</PRE>
<A name="Arguments"><B><FONT SIZE="+1">Arguments</FONT></B></A>
<P>

</PRE>
<B>Input/Output Parameters</B>
<PRE>
  ISPEC   (input) INTEGER
          Specifies the parameter to be returned as the value of
          UE01MD, as follows:
          = 1: the optimal blocksize; if the returned value is 1, an
               unblocked algorithm will give the best performance;
          = 2: the minimum block size for which the block routine
               should be used; if the usable block size is less than
               this value, an unblocked routine should be used;
          = 3: the crossover point (in a block routine, for N less
               than this value, an unblocked routine should be used)
          = 4: the number of shifts, used in the product eigenvalue
               routine;
          = 8: the crossover point for the multishift QR method for
               product eigenvalue problems.

  NAME    (input) CHARACTER*(*)
          The name of the calling subroutine, in either upper case
          or lower case.

  OPTS    (input) CHARACTER*(*)
          The character options to the subroutine NAME, concatenated
          into a single character string.

  N1      (input) INTEGER
  N2      (input) INTEGER
  N3      (input) INTEGER
          Problem dimensions for the subroutine NAME; these may not
          all be required.

</PRE>

<A name="Comments"><B><FONT SIZE="+1">Further Comments</FONT></B></A>
<PRE>
  None
</PRE>

<A name="Example"><B><FONT SIZE="+1">Example</FONT></B></A>
<P>
<B>Program Text</B>
<PRE>
  None
</PRE>
<B>Program Data</B>
<PRE>
  None
</PRE>
<B>Program Results</B>
<PRE>
  None
</PRE>

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