code: def _calculate_step_size_x(input_matrix):
      """This function calculates the step of dx for scaled elementary effects"""
      max_y = np.max(input_matrix, axis=1)
      min_y = np.min(input_matrix, axis=1)
  
      delta = max_y - min_y
      return delta
  
imports: from typing import Dict, List
  import numpy
  from scipy.stats import norm
  from .None import common_args
  from ..util import read_param_file, compute_groups_matrix, ResultDict, _define_problem_with_groups, _compute_delta, _check_groups
label_desc: Use image node_id 13 for calling a global function with example usage: _calculate_step_size_x(input_matrix) and returns: delta