AlbertoVe

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13 years, 199 days

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These are questions asked by AlbertoVe

Hi to everybody.  I have to manipulate a system of partial differential equation,one by one.I have in particolar to derive a lot of time my differential equations(shallow water equations),and then to group, to substitute and at the and I need time derivative in function of spatial derivative.

I'm almost done. The problem is that now every time that  I execute a command it takes  a lot of time. The entire file takes some minuts to compile. It's so slow.

Hallo to everybody I have some problem with the partial derivation of a matrix... I want to derive all the term of a matrix for "x". The matrix contains symbolic variable that are functions of x,y,t.  How can I do that? I attach to you my sheet,I hope that you can help me

thanks a  lot

alberto

 

 

Hallo to everybody I have some problem with the partial derivation of a matrix... I want to derive all the term of a matrix for "x". The matrix contains symbolic variable that are functions of x,y,t.  How can I do that? I attach to you my sheet,I hope that you can help me

thanks a  lot

alberto

 

 

Hallo to everybody I have some problem with the partial derivation of a matrix... I want to derive all the term of a matrix for "x". The matrix contains symbolic variable that are functions of x,y,t.  How can I do that? I attach to you my sheet,I hope that you can help me

thanks a  lot

alberto

 

 

HI to everybody, I have to manipulate a system of partial differential equation,one by one.how can I do? I have in particolat to derive a lot of time my differential equations(shallow water equations),and then to group, to substitute and at the and I need time derivative in function of spatial derivative. How is the best choice for working? I think to define for example:

pde := diff(q(x, y, t), t) +(g*D-u^2)*(diff(h(x, y, t), x))-2*u*(diff(q(x, y, t), x))=0

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