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Question: problem with collect?

Question:problem with collect?

mehdi jafari 774
collect
September 02 2013
1

i have a problem in using command "collect". 

> 

eq:=a[1]*a[2]^2+a[2]*a[3]*a[1]+a[3]^3;

eq := a[1]*a[2]^2+a[1]*a[2]*a[3]+a[3]^3

 (1)
> 

collect(eq1,a[3]);

a[1]*a[2]^2+a[1]*a[2]*a[3]+a[3]^3

 (2)
> 

 

as u see, i just want to collect a[3]s,but it gives me all of the coeeficients,what is the problem ?

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