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'use strict';

module.exports = function(math) {
  var collection = math.collection;
  var isCollection = collection.isCollection;

  /**
   * Divide two values, `x / y`.
   * To divide matrices, `x` is multiplied with the inverse of `y`: `x * inv(y)`.
   *
   * Syntax:
   *
   *    math.divide(x, y)
   *
   * Examples:
   *
   *    math.divide(2, 3);            // returns Number 0.6666666666666666
   *
   *    var a = math.complex(5, 14);
   *    var b = math.complex(4, 1);
   *    math.divide(a, b);            // returns Complex 2 + 3i
   *
   *    var c = [[7, -6], [13, -4]];
   *    var d = [[1, 2], [4, 3]];
   *    math.divide(c, d);            // returns Array [[-9, 4], [-11, 6]]
   *
   *    var e = math.unit('18 km');
   *    math.divide(e, 4.5);          // returns Unit 4 km
   *
   * See also:
   *
   *    multiply
   *
   * @param  {Number | BigNumber | Boolean | Complex | Unit | Array | Matrix | null} x   Numerator
   * @param  {Number | BigNumber | Boolean | Complex | Array | Matrix | null} y          Denominator
   * @return {Number | BigNumber | Complex | Unit | Array | Matrix}                      Quotient, `x / y`
   */
  math.divide = function(x, y) {
    if (arguments.length != 2) {
      throw new math.error.ArgumentsError('divide', arguments.length, 2);
    }

    if (isCollection(x)) {
      if (isCollection(y)) {
        // TODO: implement matrix right division using pseudo inverse
        // http://www.mathworks.nl/help/matlab/ref/mrdivide.html
        // http://www.gnu.org/software/octave/doc/interpreter/Arithmetic-Ops.html
        // http://stackoverflow.com/questions/12263932/how-does-gnu-octave-matrix-division-work-getting-unexpected-behaviour
        return math.multiply(x, math.inv(y));
      }
      else {
        // matrix / scalar
        return collection.deepMap2(x, y, math._divide);
      }
    }

    if (isCollection(y)) {
      // TODO: implement matrix right division using pseudo inverse
      return math.multiply(x, math.inv(y));
    }

    // divide two scalars
    return math._divide(x, y);
  };
};
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