underscore-matrix

Module which contains the standard operation of the square matrices.

Version

0.1.0

Installation

$ npm install underscore-matrix

Initialization

var _matrix = require("underscore-matrix");

Functions

• Determinant

• Summary

• Scalar summary

• Multiply

• Scalar multiply

• Matrix inversion

• Minor

• Identity matrix

• Check is array square matrix

  ###Determinant

  _matrix.determinant(matrix);

  It will return object:

  {
      error:"Some error message",  //or false if no errors
      value:1.23                   //Float number - determinant of matrix (can be undefinde if error)
  }

  ###Summary

  _matrix.summary(matrixA,matrixB);
  //or
  _matrix.sum(matrixA,matrixB);

  It will return object:

  {
      error:"Some error message",       //or false if no errors
      value:[[1,1,1],[2,2,2],[3,3,3]]   //Result matrix with float numbers - summary of matrixA and matrixB (can be undefinde if error)
  }

  IMPORTANT! 'matrixA' and 'matrixB' must be square with the same size ###Scalar summary

  _matrix.sSummary(scalarNumber,matrix);
  //or
  _matrix.ssum(scalarNumber,matrix);

  It will return object:

  {
      error:"Some error message",       //or false if no errors
      value:[[1,1,1],[2,2,2],[3,3,3]]   //Result matrix with float numbers - summary of scalarNumber and matrix (can be undefinde if error)
  }

  Sample:

  var sum = _matrix.ssum(1,[
      [1,2,3],
      [4,5,6],
      [7,8,9]
  ]).value;
   
  //sum = [
  //          [2,3,4],
  //          [5,6,7],
  //          [8,9,10]
  //      ]

  ###Multiply

  _matrix.multiply(matrixA,matrixB);
  //or
  _matrix.mult(matrixA,matrixB);

  It will return object:

  {
      error:"Some error message",       //or false if no errors
      value:[[1,1,1],[2,2,2],[3,3,3]]   //Result matrix with float numbers - multiply of matrixA*matrixB (can be undefinde if error)
  }

  IMPORTANT! 'matrixA' and 'matrixB' must be square with the same size ###Scalar multiply

  _matrix.sMultiply(scalarNumber,matrix);
  //or
  _matrix.smul(scalarNumber,matrix);

  It will return object:

  {
      error:"Some error message",       //or false if no errors
      value:[[1,1,1],[2,2,2],[3,3,3]]   //Result matrix with float numbers - multiply of scalarNumber and matrix (can be undefinde if error)
  }

  Sample:

  var mul = _matrix.ssum(2,[
      [1,2,3],
      [4,5,6],
      [7,8,9]
  ]).value;
   
  //mul = [
  //          [2,4,6],
  //          [8,10,12],
  //          [14,16,18]
  //      ]

  ###Matrix inversion

  _matrix.inverse(matrix);

  It will return object:

  {
      error:"Some error message",       //or false if no errors
      value:[[1,1,1],[2,2,2],[3,3,3]]   //Inverse of a matrix (can be undefinde if error)
  }

  IMPORTANT! determinant of matrix can't be 0 ###Minor Return minor of matrix

  _matrix.minor(di,dj,matrix);

  It will return object:

  {
      error:"Some error message",       //or false if no errors
      value:[[1,1,1],[2,2,2],[3,3,3]]   //Minor matrix or undefinde if error
  }

  Sample:

  var minor = _matrix.minor(0,1,[
                                  [1,2,3],
                                  [11,12,13],
                                  [21,22,23]
                              ]).value;
   
  // minor = [ 
  //          [ 11, 13 ], 
  //          [ 21, 23 ] 
  //        ]

  ###Identity matrix

  _matrix.I(n);

  It will return object:

  {
      error:"Some error message",       //or false if no errors
      value:[[1,0,0],[0,1,0],[0,0,1]]   //n-size identity matrix (can be undefinde if error)
  }

  ###Check is array square matrix

  _matrix.isSquareMatrix(matrix);

  It will return object:

  {
      error:"Some error message",       //or false if matrix is square
      value:[[1,1,1],[2,2,2],[3,3,3]]   //matrix 
  }

  If some of matrix elements is numeric string, this function will convert them to float numbers and return matrix with only float type elements.

License

MIT

Enjoy!