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<code> import numpy as np

def altblocks(idf,dur,dt,RP):

  aDur = np.arange(dt,dur+dt,dt)    # in minutes
  aInt = (idf[0]*RP**idf[1])/((aDur+idf[2])**idf[3])  # idf equation - in mm/h
  aDeltaPmm = np.diff(np.append(0,np.multiply(aInt,aDur/60.0)))
  aOrd=np.append(np.arange(1,len(aDur)+1,2)[::-1],np.arange(2,len(aDur)+1,2))
  prec = np.asarray([aDeltaPmm[x-1] for x in aOrd])
  aAltBl = np.vstack((a,b))
  return aAltBl
  

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