NEA-0212 SAHYB-2.

SAHYB-2, Solution of Ordinary Differential Equation with User-Supplied Subroutine

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: SAHYB-2.

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2. COMPUTERS

To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.

Program name	Package id	Status	Status date
SAHYB-2	NEA-0212/01	Tested	01-NOV-1967

Machines used:

Package ID	Orig. computer	Test computer
NEA-0212/01	IBM 360 series	IBM 360 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

SAHYB-2 is a general purpose programme for the solution of ordinary differential equations. These are written in a user-supplied subroutine called DER, which uses notations very close to mathematical formulas. Special mathematical functions are included in the programme, as:
Function generation, delay generation, steps, ramps and pulses, as well as a simplified standard output procedure - boundary value problems or parametric optimisation may be handled by iterations adding a subroutine called REPEAT.

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4. METHOD OF SOLUTION

Integration is carried out by constant step fourth-order Runge-Kutta method, or by a fixed or variable step Adams-Moulton predictor corrector method.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maximum 150 differential equations of the first order.
Maximum 30 tables for function generator or delay lines.

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6. TYPICAL RUNNING TIME

Varies greatly with the size of problem - range from few minutes for small systems (less than 10 differential equations) to a half hour for large problems.

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7. UNUSUAL FEATURES OF THE PROGRAM

Uses for the problem description an analogue oriented vocabulary which is a sub set of FORTRAN, and is easily handled by engineers or physicists who are not programming specialists.

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8. RELATED AND AUXILIARY PROGRAMS

Uses the subroutines for the CALCOMP digital plotter described in report EURATOM 2280/F, by P. Moinil and J. Pire. (programmation relative our CALCOMP).

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9. STATUS

Package ID	Status date	Status
NEA-0212/01	01-NOV-1967	Tested at NEADB

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10. REFERENCES

      H. D Hoop and R. Monterosso:
      SAHYB-2 - A Programme for the Solution of Differential Equations Using an Analogue-Oriented Language.
      Report EURATOM 3622/E

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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0212/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: Standard FORTRAN monitor.

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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15. NAME AND ESTABLISHMENT OF AUTHOR

        H. d'Hoop and R. Monterosso
        Commission des Communautes Europeennes
        CETIS
        21020 - Ispra
        Italy

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16. MATERIAL AVAILABLE

NEA-0212/01

File name	File description	Records
NEA0212_01.001	SOURCE & DATA 360/65	1701
NEA0212_01.002	OUTPUT	108

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17. CATEGORIES

P. General Mathematical and Computing System Routines

Keywords: ordinary differential equations, programming languages, special functions.