DOTLEFTDIVIDE DOTLEFTDIVIDE Element-wise Left-Division Operator

Usage

Divides two numerical arrays (elementwise) - gets its name from the 
fact that the divisor is on the left.  There are two forms
for its use, both with the same general syntax:

  y = a .\ b

where a and b are n-dimensional arrays of numerical type.  In the
first case, the two arguments are the same size, in which case, the 
output y is the same size as the inputs, and is the element-wise
division of b by a.  In the second case, either a or b is a scalar, 
in which case y is the same size as the larger argument,
and is the division of the scalar with each element of the other argument.

The type of y depends on the types of a and b using type 
promotion rules, with one important exception: unlike C, integer
types are promoted to double prior to division.