negate method

Implementation

void negate() {
  _m3storage[0] = -_m3storage[0];
  _m3storage[1] = -_m3storage[1];
  _m3storage[2] = -_m3storage[2];
  _m3storage[3] = -_m3storage[3];
  _m3storage[4] = -_m3storage[4];
  _m3storage[5] = -_m3storage[5];
  _m3storage[6] = -_m3storage[6];
  _m3storage[7] = -_m3storage[7];
  _m3storage[8] = -_m3storage[8];
}