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Question: How to obtain the coefficents of variable???(Basic Question)

Question:How to obtain the coefficents of variable???(Basic Question)

kenryu 4 Maple
May 21 2007
0
>alias(phi=phi(x)): > U := u[0](x)*phi^(j-2): > cc := expand(6*U*(diff(U, x))): > select(has, cc, 1/phi^5); # can obtain > coeff(cc,phi^(2*j-5)); # obtain 0 0 > select(has, cc, phi^(2*j-5)); # obtian 0 0 I want to obtain the coefficents of variable,phi^(2*j-5), but both "coeff" and "selcet" are invaild. How to obtain the coefficents?? Many thanks in advance!
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