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#calculating )the timestep 
#calculating )the timestep 
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h=(1./5.)*sqrt(rho/(lam+2*mu))*(mx/ndx) 
h=(1./5.)*sqrt(rho/(lam+2*mu))*(mx/ndx) 
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#Check to make sure number of time steps is not too large. 
#Check to make sure number of time steps is not too large. 
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print "Time step size= ",h, "Expected number of outputs= ",tend/h 
print("Time step size= ",h, "Expected number of outputs= ",tend/h) 
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#uncomment the following lines to give the user a chance to stop 
#uncomment the following lines to give the user a chance to stop 
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#proceeder = raw_input("Is this ok?(y/n)") 
#proceeder = raw_input("Is this ok?(y/n)") 