Function add

add(out: mat2.Mat2, a: mat2.Mat2, b: mat2.Mat2): mat2.Mat2
Adds two mat2's
Parameters
- out: mat2.Mat2
  the receiving matrix
- a: mat2.Mat2
  the first operand
- b: mat2.Mat2
  the second operand
Returns mat2.Mat2
out
- Defined in core/mat2.ts:319