control_systems_torbox 0.2.1

Control systems toolbox
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<HTML>
<HEAD><TITLE>MA01CD - SLICOT Library Routine Documentation</TITLE>
</HEAD>
<BODY>

<H2><A Name="MA01CD">MA01CD</A></H2>
<H3>
Safely computing the sign of a sum of two real numbers represented using integer powers of a base
</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 compute, without over- or underflow, the sign of the sum of two
  real numbers represented using integer powers of a base (usually,
  the machine base). Any base can be used, but it should the same
  for both numbers. The result is an integer with value 1, 0, or -1,
  depending on the sum being found as positive, zero, or negative,
  respectively.

</PRE>
<A name="Specification"><B><FONT SIZE="+1">Specification</FONT></B></A>
<PRE>
      INTEGER FUNCTION MA01CD( A, IA, B, IB )
C     .. Scalar Arguments ..
      INTEGER           IA, IB
      DOUBLE PRECISION  A, B

</PRE>
<B><FONT SIZE="+1">Function Value</FONT></B>
<PRE>
  MA01CD  INTEGER
          The sign of the sum of the two numbers, which is usually
          either 1, or -1. If both numbers are 0, or if they have
          the same exponent and their sum is 0, the returned value
          is 0.

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

</PRE>
<B>Input/Output Parameters</B>
<PRE>
  A       (input)  DOUBLE PRECISION
          The first real scalar.

  IA      (input)  INTEGER
          Exponent of the base for the first real scalar. The scalar
          is represented as A * BASE**(IA).

  B       (input)  DOUBLE PRECISION
          The first real scalar.

  IB      (input)  INTEGER
          Exponent of the base for the first real scalar. The scalar
          is represented as B * BASE**(IB).

</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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