class_docstr: Example
  -------
  mu=.00     # deterministic drift
  sig=.20 # Gaussian component
  l=3.45 # Poisson process arrival rate
  a=0 # drift of log-jump
  D=.2 # st.dev of log-jump
  
  X = JumpDiffusionMerton().simulate(mu,sig,lambd,a,D,ts,nrepl)
  
  plt.figure()
  plt.plot(X.T)
  plt.title('Merton jump-diffusion')
code: def __init__(self):
      pass
  
imports: import numpy
  import matplotlib.pyplot
label_desc: Use image node_id 1 to create a new JumpDiffusionMerton object  with example: obj = JumpDiffusionMerton()