code: public SDVariable logNormal(String name, double mean, double stddev, long... shape) {
          SDVariable ret = f().randomLogNormal(mean, stddev, shape);
          return updateVariableNameAndReference(ret, name);
      }
docs: Generate a new random SDVariable, where values are randomly sampled according to a Log Normal distribution,
  i.e., {@code log(x) ~ N(mean, stdev)}<br>
  
  @param name   Name of the new SDVariable
  @param mean   Mean value for the random array
  @param stddev Standard deviation for the random array
  @param shape  Shape of the new random SDVariable
  @return New SDVariable