code: def rmatmul_plain_ix1(self):
      getattr(self.ec, "rmatmul_plaintext_ix1_f64")(self.d)
  
imports: import pytest
  import operator
  import os
  import numpy
  import phe
label_desc: Use image node_id 13 for calling the BenchSuite obj's underlying member method code with example usage: obj.rmatmul_plain_ix1() without return types