itk/Matrix.js

High performance spatial analysis in a JavaScript runtime environment.

function Matrix(rows, columns) {
  if (rows instanceof Matrix) {
    var other = rows;
    this.rows = other.rows;
    this.columns = other.columns;
    this.data = other.data.slice();
  } else {
    this.rows = rows;
    this.columns = columns;
    this.data = new Array(rows * columns);
    this.data.fill(0.0);
  }
}

Matrix.prototype.setIdentity = function () {
  for (var ii = 0; ii < this.rows; ++ii) {
    for (var jj = 0; jj < this.columns; ++jj) {
      if (ii === jj) {
        this.data[jj + ii * this.columns] = 1.0;
      } else {
        this.data[jj + ii * this.columns] = 0.0;
      }
    }
  }
};

Matrix.prototype.setElement = function (row, column, value) {
  this.data[column + row * this.columns] = value;
};

Matrix.prototype.getElement = function (row, column) {
  return this.data[column + row * this.columns];
};

module.exports = Matrix;