I have posted this in the syntax section but I m not sure if it the good section so I also post here.
I'm trying at present to construct classes presented by jeff heaton in his book introduction to neural network for java : http://www.heatonresearch.com/online/introduction-neural-networks-java-edition-2...
Those classes are useful for every example of neural network jeff heaton give in his book so I need them anyway.
Here is what I tried to do(probably an aberration):
Code:


Code:

class  Matrix 
{    
  private int r;
  private int c;
  private double[][] M;

 public Matrix(final double[][]input)
  {
    M = input;
  }
 
  public void add(int row, int col, double value)
  {
     r = row;
     c = col;
    for(int i = 0; i<r; i++){
      for(int j = 0; j<c; j++){
        M[i][j] = value;
      }
    }
  }
}

public static class MatrixMath{
public  static Matrix add(final Matrix m1,final Matrix m2)
  {
    final double result[][] = new double[m1.getRows()][m1.getCols()];
    for (int resultRow = 0; resultRow < m1.getRows(); resultRow++) {
for (int resultCol = 0; resultCol < m1.getCols(); resultCol++) {
       result[resultRow][resultCol] = m1.get(resultRow, resultCol)+ m2.get(resultRow, resultCol);
}
}
return new Matrix(result);
  }
  
}
  

Does someone have an idea how I could define my classes?
Especially MatrixMath class, I don't know how to deal with.
Jeff Heaton don't talk about constructor and use only static methods in this class. What I made is probably stupid but I don't know where.
thanks,
théo

Ok, sorry, I removed the one in the syntax section
théo

Hi SimaSingh86,
Encog seems to be a georgous library, but quite far for my understanding by now, I guess.
Thank you for your explanation of the use of the MatrixMath class.
The link for the forum didn't appeared, could you post it again ?

You should put such class (which doesn't use the PApplet context anyway) in a Java tab (ie. a .java file): all classes in .pde files are internal to the main sketch's class, and they can't use static fields. In a .java file, such classes are OK.

Don't be afraid, Processing is pure Java (almost!), with a bit of sugar on top to make it more edible.
The code you show is actually pure Java...
If you put it in a Java tab, it will be integrated to the sketch, so you still don't have to define the main class, the main() method, etc.

Note: Processing doesn't like much doubles, unless you need high precision, perhaps stick to float type.

So I tryed without sugar and it almost work. Still one thing I don't understand, it's how I can make severals constructors for a Matrix class, squared matrix, one column or one row matrix and define the methods like getRows on it with sometimes a 2D array and sometimes a 1D array?

Yes, but does it mean I have to make several methods for one operation ?
like :
Code:

public static Matrix multiply(final Matrix m1, float m)
  {
    final float result[][] = new float[m1.getRows()][m1.getCols()];
    for (int row = 0; row < m1.getRows(); row++) {
      for (int col = 0; col < m1.getCols(); col++) {
        result[row][col] = m1.get(row, col) * m;
      }
    }
    Matrix m2 = new Matrix(result);
    return m2;
  }
public static Matrix multiply(final Matrix m1, float m)
  {
    final float result[] = new float[m1.length];
    for (int i = 0; i< m1.length; i++) {
        result[i] = m1.get(i) * m;
      }
    Matrix m2 = new Matrix(result);
    return m2;
  } 

and the same for every operations?

thank you so much PhiLho, you help me a lot.
The second solution attracts me but I am not sure what you mean by generic Matrix class. And are you talking about parent class and subclasses? Sorry for my slow understanding...