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Question: Puzzling output from the EulerLagrange command (VariationalCalculus package)

Question:Puzzling output from the EulerLagrange command (VariationalCalculus package)

John Starrett 178 Maple
April 03 2013
0

Notice that the order of the output from the EulerLagrange command when three functions are input does not correspond to the order of the functions listed, and when they are requested separately, the last function is not included:

with(VariationalCalculus):

T3:=(1/2)*m*(diff(r(t),t)^2+r(t)^2*diff(theta(t),t)^2+diff(z(t),t)^2):
U3:=m*g*z(t):
L3:=T3-U3;

 


EL6:=EulerLagrange(L3,t,[r(t),theta(t),z(t)]);
EL6ra:=EulerLagrange(L3,t,r(t));

EL6thetaa:=EulerLagrange(L3,t,theta(t));
EL6za:=EulerLagrange(L3,t,z(t));


 



John Starrett
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