Development of numerical library software in Java

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Development of numerical library software in Java

• Feb 8 , 2000
• H.Okazawa, Shizuoka Seika College, Japan
• and
• T.Sasaki, KEK,Japan

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Contents

• Introduction
• Object Oriented Programming
• Analysis and Design of Numerical library
• Fitting program in OOA/OOD
• Summary

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Introduction(1)

• We present
• Our attempt on OO analysis and OO development to
  the general numerical library in Java
• The development of data fitting program with
  OOA/OOD
• The detail of the design as a first step of
  development of numerical analysis libraries in
  Java

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Introduction(2)

• HEP Analysis
• Software components tend to be large
• Software will be used for more than 10 yeas or
  so.

Object Oriented technique -Reuse software
component -Change the specification of the
software -Understand an overall of the system.
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Introduction(3)

• The need of Common Interface for numerical
  library
• Different products have different interfaces
• Make difficult to
• Try another algorithm
• Implement a new functionary
• The need of well designed software
• Minimum effort in changing users code
• Increases reliability and production capability
  of software

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Object Oriented Programming(1)

• Why we use Java?
• C
• Illustrates high-level performance
• Has various runtime libraries used in C language
• Takes long time in understanding or developing
  software for no expert of C programming
• Java, simple OO language
• Easy to understand and integrate the software
• Easily moved among computing platforms
• Very safe and reliable under networking condition
• Easy to import visualization program to many
  platforms

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Object Oriented Programming(2)
Ref JAVA World 12, 1999
A Excellent B Good C Available D Not supported
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Analysis and Design of Numerical library(1)

• It is difficult to develop numerical library in
  Java because.
• C
• Functions in numerical library are implemented as
  Template functions.
• Java
• No template functionary
• Everything must be in class

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Analysis and Design of Numerical library(2)

• We investigated 2 scenario for the development of
  numerical library in Java.
• Scenario 1
• The object is identified to manage the numerical
  library.
• The super class are prepared and all of other
  functionary is realized to inherit it.
• Only interfaces are defined in the super class.
• Scenario 2
• Objects are identified as variables or arrays to
  be used for mathematical manipulations.
• lt Need to define so many classes according to
  basic data types in Java.

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Analysis and Design of Numerical library(3)

• However Scenario 1 looks a bit far from native OO
  concepts, it has advantage in simplicity of
  implementation and also maintainability.
• Usecase diagram from Scenario 1

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Development of fitting program in OOA/OOD(1)

• We plan to develop several numerics classes.
• As an example of implementation of a functionary
  of
• numerical library, a fitting program was
  developed.

Numerics
Evaluator
Integrator
Equator
Sorter
Fitter
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Development of fitting program in OOA/OOD(2)

• Class diagram for fitting program

Matrix
Numerics
Fitter
add()
inputData()
leastSquare()
transpose()
action()
Marquardt()
divide()
result()
chisq()
subtract()
UserDefinedFitter
PolynomialFitter
GaussianFitter
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Development of fitting program in OOA/OOD(3)
A Sample result from polynomial fitter
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Development of fitting program in OOA/OOD(4)
If you want to add your own function, you just
extend new function class you need. Or you can
easily find out where to change the code from
class diagram. Although this class library is
very simple now, further iteration of analysis,
design and implementation makes more elegant,
widely usable software package.
package Numerical public class MyOwnFitter
extends Fitter public void myfunc()
double x double y double a
for(int i0 iltnarray i) y
ai0Math.pow() ai1x...
return
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Summary

• Attempt OOA/OOD on the numerical library in Java
• A simple Java fitting software by OOA/OOD was
  developed on it
• prepared reusable package