code: public T minus( T B ) {
          convertType.specify(this,B);
          T A = convertType.convert(this);
          B = convertType.convert(B);
          T ret = A.createLike();
  
          A.ops.minus(A.mat,B.mat,ret.mat);
          return ret;
      }
docs: <p>
  Returns the result of matrix subtraction:<br>
  <br>
  c = a - b <br>
  <br>
  where c is the returned matrix, a is this matrix, and b is the passed in matrix.
  </p>
  
  @see CommonOps_DDRM#subtract(DMatrixD1, DMatrixD1, DMatrixD1)
  
  @param B m by n matrix. Not modified.
  
  @return The results of this operation.