JMathTools is a collection of independent packages designed to fit common engineering/scientific computing needs. For now, JMathTools contains:

• JMathArray: simple linear algebra for double[][] arrays using static methods
• JMathPlot: interactive plot in 2D / 3D
• JMathIO: binary and ASCII input/output for double arrays

JMathTools is designed to be:

• easy to integrate in your java applications
• easy to extend and modify

It was initially developed to provide easy to use java API in Matlab to Java porting task.

JMathTools was NOT designed to be:

• a high performance computing engine
• a high performance 3D visualization tool

For such things, many free Java packages are available (see Links).

Provides a list of static methods applicable on int and double arrays:

• merge, insert, delete rows and columns : org.math.array.DoubleArray,org.math.array.IntegerArray
• simple linear algebra: LU, QR, EigenValues, Cholesky, SingularValues (based on JAMA package): org.math.array.LinearAlgebra
• simple statistics: mean, variance, covariance, histograms : org.math.array.StatisticSample
• some random generators (based on RnGPack): normal, lognormal, triangular, chi square, weibull, ... : org.math.array.StatisticSample

import static org.math.array.LinearAlgebra.*;
...
  // random 4 x 4 matrix + Id
  double[][] A = plus(random(4, 4), identity(4));
		
  // Eigen values Decomposition : A = V * D * V^-1
  EigenvalueDecomposition eig = eigen(A);
  double[][] V = eig.getV();
  double[][] D = eig.getD();

JMathArray syntax is stable. Only new features may be added, and current syntax will stay available.

→ Download jar
→ Doxygen doc
→ Tutorial

Provides :

• 2D/3D scatter plot
• 2D/3D line plot
• 2D staircase plot
• 2D/3D histogram plot
• 2D/3D boxplot
• 3D grid plot
• 2D/3D quantiles on plots

import org.math.plot.*;
...
  
  double[] x = ...
  double[] y = ...
 
  // create your PlotPanel (you can use it as a JPanel)
  Plot2DPanel plot = new Plot2DPanel();
 
  // add a line plot to the PlotPanel
  plot.addLinePlot("my plot", x, y);
 
  // put the PlotPanel in a JFrame, as a JPanel
  JFrame frame = new JFrame("a plot panel");
  frame.setContentPane(plot);
  frame.setVisible(true);

JMathPlot syntax is NOT stable. As far as possible current syntax will stay available.

→ Download jar
→ Doxygen doc
→ Tutorial

JMathIO allows to create, read, write, append your datas in:

• ASCII files : org.math.io.files.ASCIIFile
• Binary files (big or little endian) : org.math.io.files.BinaryFile

import static org.math.io.files.ASCIIFile.*;
import static org.math.io.parser.ArrayString.*;
 
...
 
  double[][] b = { { 1.0, 2.0, 3.0, 4.0 }, { 11.0, 12.0, 13.0, 14.0 } };
  // write file in ASCII
  writeDoubleArray(new File("b.txt"), b);
  // read this file
  double[][] b_read = readDoubleArray(new File("b.txt"));

JMathIO syntax is considered stable. Only new features may be added, and current syntax will stay available.

→ Download jar
→ Doxygen doc
→ Tutorial