Simultaneous Equations and OVERFL (IBIG)
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Simultaneous Equations and OVERFL (IBIG)

I'm porting some old fortran code from a UNIVAC system of Fortran IV or V.

There were various math libraries available then and I'd used one for
solving simultaneous equations.  I have the source code for the routine I've
called (and perhaps others called SIMEQ).

Subroutine SIMEQ frequently does this:

CALL OVERFL (IBIG)

Now, I don't think there's such a library function on my DVF system and I'd
just as soon go ahead and continue to use this SIMEQ subroutine with a
suitable replacement to these OVERFL calls - or to just eliminate them
altogether.

Does anyone know what I'm dealing with here specifically?  I believe one of
the main math libaries was called Mathpack.

Thanks,  Fred

Wed, 18 Jun 1902 08:00:00 GMT
Simultaneous Equations and OVERFL (IBIG)

Quote:

>I'm porting some old Fortran code from a UNIVAC system of Fortran IV or V.

>There were various math libraries available then and I'd used one for
>solving simultaneous equations.  I have the source code for the routine I've
>called (and perhaps others called SIMEQ).

>Subroutine SIMEQ frequently does this:

>CALL OVERFL (IBIG)

>Now, I don't think there's such a library function on my DVF system and I'd
>just as soon go ahead and continue to use this SIMEQ subroutine with a
>suitable replacement to these OVERFL calls - or to just eliminate them
>altogether.

>Does anyone know what I'm dealing with here specifically?  I believe one of
>the main math libaries was called Mathpack.

>Thanks,  Fred

From Sperry's manual "FORTRAN(ASCII) Level 9r1", printed 1979.

The OVERFL subroutine tests for exponent overfow.
Form: CALL OVERFL ( i ) where i is an integer variable or array element.
OVERFL determines whether or not an exponent overflow has occurred since
last call to OVERFL/OVUNFL (or the start of the program, if  OVERFL/OVUNFL
has not been previously called).
..
If an overflow condition has occurred, the value returned in i is 1.
..
If non overflow condition has occurred, the value returned in i 2.
After the value of i has been set, the overflow indicator is cleared.

Hope this helps,
Kurt

Building Science, Lund Institute of Technology
Lund University, Sweden

Wed, 18 Jun 1902 08:00:00 GMT

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