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Question: Bug in the D operator?

Question:Bug in the D operator?

Rouben Rostamian 7938
derivative diff operator
March 19 2015
0

In the following, the diff operator calcuates the derivative correctly, but the D operator doesn't.  A bug?

> 

restart;
> 

f := x -> a[1][2]*x;    # the double index on a[][] is intended

proc (x) options operator, arrow; a[1][2]*x end proc

  
> 

diff(f(x), x);

a[1][2]

  
> 

D(f)(x);

(D(f))(x)

  


Here is a worksheet containing the commands above in case you want to try it yourself: mw.mw
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