cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Showing results for 
Search instead for 
Did you mean: 

Sometimes when I evaluate a derivative symbolically in mathcad of a certain function, it gives me 0 when its not

prajendran
11-Garnet

Sometimes when I evaluate a derivative symbolically in mathcad of a certain function, it gives me 0 when its not

4 REPLIES 4

Separate out the function, and it will evaluate.  Don't know why your sheet fails.

RichardJ
19-Tanzanite
(To:prajendran)

It's a problem with labels. You have two occurrences of phi with different labels, so Mathcad views them as different. It's equivalent to d/dA(f(B)), which is of course zero. Set the labels to both be "variable" and it works

In Mathcad Prime you have to be careful with labels!

It would have been better to continue the previous thread rather than starting a new one.

I couldn't attach a new file in the reply.... so i had 2 start a new one....

I dont know where I had phi as different labels?

Announcements
Check out the latest
Mathcad Tip
"PTC Mathcad 15 / Prime 1-6 Update."