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Question: Using a subscripted variable in a derivative

Question:Using a subscripted variable in a derivative

Ratch 216 Maple 16
subscript
June 24 2013
0

> 

restart
> 

X := 4*`#msub(mi("I"),mi("co"))`

4*`#msub(mi("I"),mi("co"))`

 (1)
> 

(ⅆ)/(ⅆ I[co]) I[co]

Error, invalid derivative

(ⅆ)/(ⅆ I[co]) I[co]

  
> 

Y := 4*J[co]

4*J[co]

 (2)
> 

diff(Y, J[co])

4

 (3)
> 

``



Download derivative.mw

As shown above, differentiating with respect to a literal (CNTL+_) subscript. fails.  However, doing so with a regular subscript (CNTL+_) succeeds.  Why can't I differentiate with both?

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