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NEA-1112 TENDANCES.

TENDANCES, Search for Tendencies by Least Squares Fit Method

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1. NAME OR DESIGNATION OF PROGRAM:  TENDANCES.
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2. COMPUTERS
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Program name Package id Status Status date
TENDANCES NEA-1112/02 Tested 01-OCT-1987

Machines used:

Package ID Orig. computer Test computer
NEA-1112/02 IBM 3033 IBM 3084
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3. DESCRIPTION OF PROGRAM OR FUNCTION

The search of tendencies is an  application of the mean square method. Its objective is the better possible evluation of the basic data used in the calculations from the comparison between measurements of integral characteristics and  the corresponding theoretical results.
"TENDANCES" performs the mean square minimizations and gives the informations allowing the analysis of these minimizations.
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4. METHOD OF SOLUTION:  The linear systems are solved by Gauss' method.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The program is written in fixed dimensions for the blocks: 30 basic parameters and  200 integral informations; but this can be easily modified.
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6. TYPICAL RUNNING TIME

From a few seconds to a few tens of seconds depending on the complexity of the problem.
NEA-1112/02
NEA-DB compiled, linked and executed the test case included in this package on an IBM 3084 computer in 3.65 seconds of CPU time.
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7. UNUSUAL FEATURES OF THE PROGRAM

"TENDANCES" were developped for the qualification of "APOLLO" which performs neutron calculations (k effective, reaction rates, nuclide concentrations,...) from basic nuclear data. Any code giving integral quantities which can be compared with experimental results could be qualified thanks to "TENDANCES" analyses.
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8. RELATED AND AUXILIARY PROGRAMS

The inputs of data are made by RPSLD subroutines; the Gauss' inversion is performed by ALGAU; for some applications the eigen elements of a matrix are calculated by AEJAC.
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9. STATUS
Package ID Status date Status
NEA-1112/02 01-OCT-1987 Tested at NEADB
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10. REFERENCES:
NEA-1112/02, included references:
- P. Reuss:
  La Methode de Recherche de Tendances.
  CEA-N-2222  (Aout 1981)
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11. MACHINE REQUIREMENTS

NEA 1112/02: The program was compiled linked and executed on an IBM 3084 computer in 265K bytes of main storage.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-1112/02 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  Standard IBM.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
Necessary memory: 220K.
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15. NAME AND ESTABLISHMENT OF AUTHORS

          Paul Reuss
          DEMT/SERMA
          C.E.N. Saclay
          91191 Gif-sur-yvette, France
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16. MATERIAL AVAILABLE
NEA-1112/02
File name File description Records
NEA1112_02.001 Information file 71
NEA1112_02.002 Fortran source 1917
NEA1112_02.003 Sample input data 41
NEA1112_02.004 Sample output list 414
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17. CATEGORIES
  • P. General Mathematical and Computing System Routines

Keywords: least square fit.