matrixsoup

Installation

$ npm install matrixsoup

Matrix constructor

Usage

var Matrix = require('matrixsoup');
var _2DMatrix = new Matrix(2,2);
console.log(_2DMatrix);

This will create a 2x2 matrix object which would appear as:

{ 
    val: [ [ 1, 0 ], [ 0, 1 ] ],
    determinant: 1,
    adjoint: [ [ 1, 0 ], [ 0, 1 ] ],
    inverse: [ [ 1, 0 ], [ 0, 1 ] ],
    valString: '\n\t|\t1\t0\t|\n\t|\t0\t1\t|',			//these will be explained soon
    adjointString: '\n\t|\t1\t0\t|\n\t|\t0\t1\t|',
    inverseString: '\n\t|\t1\t0\t|\n\t|\t0\t1\t|'
}
 

1. First argument for number of rows of the new matrix.
2. Second argument for number of columns of the new matrix.
3. Third argument [is optional]: can be set as true or false.
   • [false] for creating null matrix.
   • [not false](example: "banana", "potato", "crispy", "", "$#*t!~"), creates an identity matrix.
4. Properties :
   • val : The matrix bound to the Matrix object instance.
   • determinant : The magnitude of the Matrix.
   • adjoint : The matrix formed by taking transpose of cofactor-matrix of the original matrix.
   • inverse : if [A][B] = [I], where [A] and [B] are matrices of same order, then [B] is inverse of [A]. This property holds true only for square matrices having |A| != 0. For non-square matrix, say A, the property is set as [NaN] also for |A| = 0 matrices.
5. String representations : -valString -adjointString -inverseString

Methods

1. Matrix.set([array], rows, cols):

isChainable: True

1. First argument is a 1-D array to be converted to a matrix.
2. Second argument for number of rows of the new matrix.
3. Third argument for number of coloumns of the new matrix.

This method will update the determinant, adjoint, inverse and string properties each time it is called.

console.log(_2DMatrix.set([1,2,3,4],2,2));

gives output:-

{ val: [ [ 1, 2 ], [ 3, 4 ] ],
  determinant: -2,
  adjoint: [ [ 4, 2 ], [ -3, -1 ] ],
  inverse: [ [ -2, -1 ], [ 1.5, 0.5 ] ],
  valString: '\n\t|\t1\t2\t|\n\t|\t3\t4\t|',
  adjointString: '\n\t|\t4\t2\t|\n\t|\t-3\t-1\t|',
  inverseString: '\n\t|\t-2\t-1\t|\n\t|\t1.5\t0.5\t|' }

To understand the string properties, consider the following.

console.log(_2DMatrix.valString);
console.log(_2DMatrix.adjointString);
console.log(_2DMatrix.inverseString);

        |       1       2       | //valString
        |       3       4       |
 
        |       4       2       | //adjointString
        |       -3      -1      |
 
        |       -2      -1      | //inverseString
        |       1.5     0.5     |

2. Matrix.transpose():

isChainable: True

Transposes an NxM matrix: the resultant matrix appears as if rotated 90° anti-clockwise. The transpose method also updates the adjoint, inverse and the string representations.

console.log(_3DMatrix.set([1,2,3,4,4,6,5,3,2],3,3));
console.log(_3DMatrix.transpose());

{ val: [ [ 1, 2, 3 ], [ 4, 4, 6 ], [ 5, 3, 2 ] ],									//Notice this...
  determinant: 10,
  adjoint: [ [ -10, 5, 0 ], [ 22, -13, 6 ], [ -8, 7, -4 ] ],						//and this...
  inverse: [ [ -1, 0.5, 0 ], [ 2.2, -1.3, 0.6 ], [ -0.8, 0.7, -0.4 ] ],				//this as well...
  valString: '\n\t|\t1\t2\t3\t|\n\t|\t4\t4\t6\t|\n\t|\t5\t3\t2\t|',
  adjointString: '\n\t|\t-10\t5\t0\t|\n\t|\t22\t-13\t6\t|\n\t|\t-8\t7\t-4\t|',
  inverseString: '\n\t|\t-1\t0.5\t0\t|\n\t|\t2.2\t-1.3\t0.6\t|\n\t|\t-0.8\t0.7\t-0.4\t|' }
 
{ val: [ [ 1, 4, 5 ], [ 2, 4, 3 ], [ 3, 6, 2 ] ],											//the value transposed
  determinant: 10,																			//determinant stays the same
  adjoint: [ [ -10, 22, -8 ], [ 5, -13, 7 ], [ 0, 6, -4 ] ],								//adjoing is transposed
  inverse: [ [ -1, 2.2, -0.8 ], [ 0.5, -1.3, 0.7 ], [ 0, 0.6, -0.4 ] ],						//and so is the inverse!
  valString: '\n\t|\t1\t4\t5\t|\n\t|\t2\t4\t3\t|\n\t|\t3\t6\t2\t|',
  adjointString: '\n\t|\t-10\t22\t-8\t|\n\t|\t5\t-13\t7\t|\n\t|\t0\t6\t-4\t|',				//this has impacted the
  inverseString: '\n\t|\t-1\t2.2\t-0.8\t|\n\t|\t0.5\t-1.3\t0.7\t|\n\t|\t0\t0.6\t-0.4\t|'	//string representations
}  																		//Cool! right?

3. Matrix.add([A],([B],...)):

@isChainable: true

The add method allows variable number of matrices to be sent as arguments to be added with the matrix. This updates the determinant, adjoint, inverse and string representations.

var _3DMatrix1 = [
                    [-1, -2, -1],
                    [-1, 0,  -2],
                    [-2, -3,  0]
];
var _3DMatrix2 = [
                    [1, 0, 2],
                    [4, 3, 3],
                    [2, -3,4]
];
var _3DMatrix = new Matrix(2,2,true);	
_3DMatrix.set([1,2,3,4,4,6,5,3,2],3,3);
console.log(_3DMatrix.add(_3DMatrix1, _3DMatrix2));

The output

{ val: [ [ 1, 0, 4 ], [ 7, 7, 7 ], [ 5, -3, 6 ] ],
  determinant: -161,
  adjoint: [ [ 63, -12, -28 ], [ -7, -14, 21 ], [ -56, 3, 7 ] ],
  inverse:
   [ [ -0.391, 0.075, 0.174 ],
     [ 0.043, 0.087, -0.13 ],
     [ 0.348, -0.019, -0.043 ] ],
  valString: '\n\t|\t1\t0\t4\t|\n\t|\t7\t7\t7\t|\n\t|\t5\t-3\t6\t|',
  adjointString: '\n\t|\t63\t-12\t-28\t|\n\t|\t-7\t-14\t21\t|\n\t|\t-56\t3\t7\t|',
  inverseString: '\n\t|\t-0.391\t0.075\t0.174\t|\n\t|\t0.043\t0.087\t-0.13\t|\n\t|\t0.348\t-0.019\t-0.043\t|' }

4. Matrix.sub([A],([B],...)):

@isChainable: true

The sub method allows variable number of matrices to be sent as arguments to be subtracted from the matrix. This updates the determinant, adjoint, inverse and string representations.

_3DMatrix.set([1,2,3,4,4,6,5,3,2],3,3);
console.log(_3DMatrix.sub(_3DMatrix1, _3DMatrix2));

Gives output:

{ val: [ [ 1, 4, 2 ], [ 1, 1, 5 ], [ 5, 9, -2 ] ],
  determinant: 69,
  adjoint: [ [ -47, 26, 18 ], [ 27, -12, -3 ], [ 4, 11, -3 ] ],
  inverse:
   [ [ -0.681, 0.377, 0.261 ],
     [ 0.391, -0.174, -0.043 ],
     [ 0.058, 0.159, -0.043 ] ],
  valString: '\n\t|\t1\t4\t2\t|\n\t|\t1\t1\t5\t|\n\t|\t5\t9\t-2\t|',
  adjointString: '\n\t|\t-47\t26\t18\t|\n\t|\t27\t-12\t-3\t|\n\t|\t4\t11\t-3\t|',
  inverseString: '\n\t|\t-0.681\t0.377\t0.261\t|\n\t|\t0.391\t-0.174\t-0.043\t|\n\t|\t0.058\t0.159\t-0.043\t|' 
}

5. Matrix.multiply([A],([B],...)):

@isChainable: true

The multiply method allows variable number of matrices to be sent as arguments to be multiplied to the matrix. This updates the determinant, adjoint, inverse and string representations.

_3DMatrix.set([1,2,3,4,4,6,5,3,2],3,3);
console.log(_3DMatrix.multiply(_3DMatrix1, _3DMatrix2));

Gives output:

{ val: [ [ -61, -18, -69 ], [ -144, -38, -163 ], [ -96, -18, -111 ] ],
  determinant: 588,
  adjoint: [ [ 1284, -756, 312 ], [ -336, 147, -7 ], [ -1056, 630, -274 ] ],
  inverse:
   [ [ 2.184, -1.286, 0.531 ],
     [ -0.571, 0.25, -0.012 ],
     [ -1.796, 1.071, -0.466 ] ],
  valString: '\n\t|\t-61\t-18\t-69\t|\n\t|\t-144\t-38\t-163\t|\n\t|\t-96\t-18\t-111\t|',
  adjointString: '\n\t|\t1284\t-756\t312\t|\n\t|\t-336\t147\t-7\t|\n\t|\t-1056\t630\t-274\t|',
  inverseString: '\n\t|\t2.184\t-1.286\t0.531\t|\n\t|\t-0.571\t0.25\t-0.012\t|\n\t|\t-1.796\t1.071\t-0.466\t|' }

6. Matrix.scale(A,(B,...)):

@isChainable: true

The scale method allows variable number of numbers to be sent as arguments to be multiplied to the matrix as scalars. All the arguments get multiplied first and then get multiplied to the matrix. This updates the determinant, adjoint, inverse and string representations.

_3DMatrix.set([1,2,3,4,4,6,5,3,2],3,3);
console.log(_3DMatrix.scale(2,5));

Gives output:

{ val: [ [ 10, 20, 30 ], [ 40, 40, 60 ], [ 50, 30, 20 ] ],
  determinant: 10000,
  adjoint: [ [ -1000, 500, 0 ], [ 2200, -1300, 600 ], [ -800, 700, -400 ] ],
  inverse:
   [ [ -0.1, 0.05, 0 ],
     [ 0.22, -0.13, 0.06 ],
     [ -0.08, 0.07, -0.04 ] ],
  valString: '\n\t|\t10\t20\t30\t|\n\t|\t40\t40\t60\t|\n\t|\t50\t30\t20\t|',
  adjointString: '\n\t|\t-1000\t500\t0\t|\n\t|\t2200\t-1300\t600\t|\n\t|\t-800\t700\t-400\t|',
  inverseString: '\n\t|\t-0.1\t0.05\t0\t|\n\t|\t0.22\t-0.13\t0.06\t|\n\t|\t-0.08\t0.07\t-0.04\t|' }

7. Matrix.isEqual([A]):

@isChainable: false

The isEqual method checks if the passed argument matrix is equal to the matrix object's val matrix property. Returns true if equal.

var _3DMatrix1 = [
                    [-1, -2, -1],
                    [-1, 0,  -2],
                    [-2, -3,  0]
];
var _3DMatrix = new Matrix(2,2,true);	
_3DMatrix.set([1,2,3,4,4,6,5,3,2],3,3);
console.log(_3DMatrix.isEqual(_3DMatrix1));

false

8. Matrix.trace():

@isChainable: true

This method will return true if the val property of the matrix object is a symmetric matrix.

9. Matrix.isSymmetric():

@isChainable: false

This method will return true if the val property of the matrix object is a symmetric matrix.

10. Matrix.isHermitian():

@isChainable: false

This method will return true if the val property of the matrix object is a hermitian matrix.

Easter Eggs

1. Matrix.det():

@isChainable: true

This method is called implicitly by the Matrix.set(), Matrix.transpose(), Matrix.add(), Matrix.sub(), Matrix.multiply(), Matrix.scale(). This can be used to obtain the determinant of a matrix if other bound properties are not required.

var _3DMatrix = new Matrix(2,2,true);	
_3DMatrix.set([1,2,3,4,5,5,6,2,1],3,3);
var determinant = _3DMatrix.det().determinant;
console.log(determinant);

    -19

Not very useful though!

2. Matrix.adj():

@isChainable: true

This method is called implicitly by the Matrix.set(), Matrix.transpose(), Matrix.add(), Matrix.sub(), Matrix.multiply(), Matrix.scale(). This can be used to obtain the adjoint of a matrix if other bound properties are not required.

3. Matrix.adj():

@isChainable: true

This method is called implicitly by the Matrix.set(), Matrix.transpose(), Matrix.add(), Matrix.sub(), Matrix.multiply(), Matrix.scale(). This can be used to obtain the inverse of a matrix if other bound properties are not required.