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Equation Derivation with derivatives

Yuanhang Chen
Posted 11 years ago

I have been doing equation substitution and derivation with derivative terms(e.g. dudx), what happens is that the dudx will be automatically evaluated as 0, threrefore any derivation with this term goes to zero, instead of keep it as a derivative.

Any ideas to resolve this?

Thanks, YC
POSTED BY: Yuanhang Chen
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David Keith
David Keith
Posted 11 years ago 
In[1]:= D[u, x]

Out[1]= 0

In[2]:= D[u[x], x]

Out[2]= Derivative[1][u][x]

In[3]:= Dt[u, x]

Out[3]= Dt[u, x]
POSTED BY: David Keith
Yuanhang Chen
Yuanhang Chen
Posted 11 years ago

Thanks!
POSTED BY: Yuanhang Chen
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