functional-matrix-operator is a library for matrix operation in form of lazy evaluation. It supports matrix operations(Multiply, Divide, Minus, Plus, Transpose).

• Basic Featurs
  • immutable : basically all of matrix values are immutable. you can use concurrent operation with matrix.
  • funtional style : all of transforming operations are occured in funtional evaluation.
  • lazy evaluation : your matrix values are not invoked until invoke() method is called.
  • transforming (head, tail, init, last) : you can easily get a abstract subset of the matrix. it reduces overhead of copy operation.

• Support java version : 7

• Next
• Under
  • you can do the following:

double[] sample = new double[]{ 1l, 2l, 3l, 4l, 5l, 6l };
DoubleOperator head = DoubleOperator.of(1l);
DoubleMatrix one = DenseDoubleMatrix.of(2, sample);

result :

1.0,1.0,2.0
1.0,3.0,4.0
1.0,5.0,6.0

• Head
• Tail
• Init
• Last
  • you can do the following:

double[] sample = new double[]{ 1l, 2l, 3l, 4l, 5l, 6l };
DoubleMatrix one = DenseDoubleMatrix.of(2, sample);
System.out.println(one.head());

result :

1.0
3.0
5.0

• Multiply
• Minus
• Plus
• Divide
• Traspose
  • you can do the following:

double[] sample = new double[]{ 1l, 2l, 3l, 4l, 5l, 6l };
double[] transpose = new double[]{ 1l, 3l, 5l, 2l, 4l, 6l };

DoubleMatrix one = DenseDoubleMatrix.of(2, sample);
DoubleMatrix other = DenseDoubleMatrix.of(3, transpose);
DoubleMatrix result = one.multiply(other).invoke();
System.out.println(result);

result :

5.0,11.0,17.0
11.0,25.0,39.0
17.0,39.0,61.0