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Question: Why Doesn't This Substitution Work using subs or eval or anything else?

Question:Why Doesn't This Substitution Work using subs or eval or anything else?

mapleatha 160 Maple 13
eval substitution subs
February 14 2021
0

I have the expression:

This works (Ans. 144):

coeff(144*D^10,D,op(2,op(2,144*D^10)));

This works (Ans. 144):

coeff(op(3,did),D,op(2,op(2,op(3,did))));

Why doesn't this work?

eval(coeff(op(i,did),D,op(2,op(2,op(i,did)))),i=3);

Why doesn't this work?

subs(i=3,coeff(op(i,did),D,op(2,op(2,op(i,did)))));

I need those "generic" substituions for certain loops that I am making.

Thank you!

mapleatha

 

 
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