docs: @Override
      public Complex_F64 computeDeterminant() {
          if( m != n )
              throw new IllegalArgumentException("Must be a square matrix.");
  
          double realRet = pivsign;
          double realImg = 0;
  
          int total = m*stride;
          for( int i = 0; i < total; i += stride + 2 ) {
              double real = dataLU[i];
              double imaginary = dataLU[i+1];
  
              double r = realRet*real - realImg*imaginary;
              double t = realRet*imaginary + realImg*real;
  
              realRet = r;
              realImg = t;
          }
  
          det.set(realRet,realImg);
          return det;
      }