code: def main():
      plt.clf()
      plt.subplot(121)
      do_plot(True)
      plt.title("Struve H")
  
      plt.subplot(122)
      do_plot(False)
      plt.title("Struve L")
  
      plt.savefig("struve_convergence.png")
      plt.show()
  
imports: import numpy
  import matplotlib.pyplot
  import mpmath
label_desc: Use image node_id 3 for calling a global function with example usage: main() without return types