# Mathcad Second Derivative Test Issue

• Mar 21st 2011, 07:20 AM
Turlock
Mathcad Second Derivative Test Issue
I'm trying to do a simple second derivative test on mathcad but the answer I always get is 0. I'm totally baffled now.
• Mar 21st 2011, 08:53 AM
Plato
Quote:

Originally Posted by Turlock
I'm trying to do a simple second derivative test on mathcad but the answer I always get is 0. I'm totally baffled now.

How can we help you unless you post an actual problem?
• Mar 21st 2011, 11:06 AM
Turlock
I thought it would be a common error given the same result everytime.
I defined my function V(x):=xxxxxx
Then typed in the following

$\frac{d^2}{dx^2} V(Stationary point value)$

and it gives 0 everytime. I managed to work it out by doing $\frac{d^2}{dx^2} V(x)$ and typing x:=(Stationary point value) above it.
• Mar 21st 2011, 11:35 AM
Plato
Here is how I do it. It takes a second function on my version.