Function add

add(out: mat2d.Mat2d, a: mat2d.Mat2d, b: mat2d.Mat2d): mat2d.Mat2d
Adds two mat2d's
Parameters
- out: mat2d.Mat2d
  the receiving matrix
- a: mat2d.Mat2d
  the first operand
- b: mat2d.Mat2d
  the second operand
Returns mat2d.Mat2d
out
- Defined in core/mat2d.ts:337