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IAEA1268 LSQXY.

LSQXY, Curve Fitting with Uncertainty Weighting

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES
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1. NAME OR DESIGNATION OF PROGRAM:  LSQXY.
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2. COMPUTERS
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Program name Package id Status Status date
LSQXY IAEA1268/01 Tested 02-DEC-1994

Machines used:

Package ID Orig. computer Test computer
IAEA1268/01 MICROVAX DEC VAX 6000
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3. DESCRIPTION OF PROGRAM OR FUNCTION

LSQXY can be used to do curve fitting and data combination taking into account the uncertainties associated with independent variables.
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4. METHOD OF SOLUTION

To take the uncertainties of independent variables X into account in the fitting, we consider X also being the parameters to be fitted and require the results of the fitting to satisfy the constraint condition: Y = f(X;C ).
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The number of data pairs is limited to less than 100 and the number of the parameter to be fitted, C, less than 20. But these limitations are easily eliminated by adapting the code.
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6. TYPICAL RUNNING TIME

Depends on how many data are to be fitted. In general the CPU time is less than several seconds.
IAEA1268/01
The test case included in this package was run at the NEA-DB on a DEC VAX 6000-510 computer in less than one second.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
IAEA1268/01 02-DEC-1994 Tested at NEADB
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10. REFERENCES

- Zhao Zhixiang:
  "Method and Code of Curve Fitting Considering the Uncertainties
   Associated with Independent Variables"
  Communication of Nuclear Data Progress, Chinese Nuclear Data
  Center, Chinese Atomic Energy Press, No. 8, pp. 74 (1992).
IAEA1268/01, included references:
- User's Manual for LSQXY
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11. MACHINE REQUIREMENTS:
IAEA1268/01
The program as installed at the NEA-DB on a DEC VAX 6000-510 computer.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
IAEA1268/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  RMX11M V3.2.
IAEA1268/01
The test cases were run at the NEA-DB under VAX/VMS V5.5-2.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

           Zhao Zhixiang
     Chinese Nuclear Data Center
     Institute of Atomic Energy
     P.O. Box 275(41), Beijing, China
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16. MATERIAL AVAILABLE
IAEA1268/01
File name File description Records
IAEA1268_01.001 Information file 75
IAEA1268_01.002 User's manual for LSQXY 71
IAEA1268_01.003 LSQXY Fortran source 427
IAEA1268_01.004 Input data for test 1 8
IAEA1268_01.005 Output for test 1 23
IAEA1268_01.006 Input data for test 2 28
IAEA1268_01.007 Output for test 2 36
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17. CATEGORIES
  • P. General Mathematical and Computing System Routines

Keywords: data uncertainties, least square fit.