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Help with EES (take derivative from table) 
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#1
Aug2911, 04:37 PM

P: 84

I'm not sure if you're familiar with EES, but just in case I am asking here because I really have no idea what to do, as I've tried everything I could.
Basically, I want to calculate a partial derivative numerically (speed of sound) from a table of values. I have a program that produces a table of pressures and specif mass and I want to take [tex] \left( \dfrac{\partial p}{\partial \rho} \right)_s \approx \left(\dfrac{p_{i+1}  p_i}{\rho_{i+1}  \rho_i} \right) [/tex] I've tried creating procedures, functions and stuff like that but I couldn't do anything. Here's basically what I have done most times:
Then later in the code, after writing stuff to calculate both p and rho, I call that procedure: CALL Vsound(: vel) Though it says that there is no value set for rho. I believe that's because rho is calculated within the program (p is preset), though I have no idea how to solve this problem. Ideas? Thanks in advance 


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