i do not want maple to round off some terms , for example 1.7777777777 which is rounded off 1.7777777778 . i do not want maple to round off the result,what should i do ?

how can i define an index for a vector?

for example i have

V:=Vector(5)

for i to 20 do
...
V[i]=..

od.

when i write V[i] i want to address it for  "i"'s number from the loop,not element "i" of the Vector. how can i define it ?!
thnx for help 

i have a problem in using command "collect". 

what should i do ? i face this message when i want to solve my equations? can anyone help me ?view the worksheet

how should i plot from the results of the desolve? i know i should use output=listprocedure,but i do not know how to use it. thank u,
i also have another question? what is the problem with my equations that have singularity ? i used maxfun=0 and stiff=true, but it does not make changes? should i change the initial conditons?maple.mws