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modphysnoob Group TitleBest ResponseYou've already chosen the best response.0
what's your question , sailor?
 one year ago

liliy Group TitleBest ResponseYou've already chosen the best response.0
okay: i need to use derivative to verify that : p(x,t) = (1/(Sqrt[4 Pi t])) Exp[ x^2/(4 t) is the solution of the diffusion equation dp/dt= d^2p/dx^2
 one year ago

liliy Group TitleBest ResponseYou've already chosen the best response.0
i got the value for dp/dt with the function :pt = D[(1./(Sqrt[4 Pi t])) Exp[ x^2/(4 t)], t]
 one year ago

liliy Group TitleBest ResponseYou've already chosen the best response.0
but my second derivative of dx gives me 0.
 one year ago

liliy Group TitleBest ResponseYou've already chosen the best response.0
dx = D[(1./(Sqrt[4 Pi t])) Exp[ x^2/(4 t)], {x, 2}] is there soemthign wrong with my equation?
 one year ago

modphysnoob Group TitleBest ResponseYou've already chosen the best response.0
so are you trying to solve differential equation or take second derivative?
 one year ago

modphysnoob Group TitleBest ResponseYou've already chosen the best response.0
second derviative goes like this D[ Type function here ,{x,2}]
 one year ago

liliy Group TitleBest ResponseYou've already chosen the best response.0
ya thats what i did
 one year ago

modphysnoob Group TitleBest ResponseYou've already chosen the best response.0
D[(1./(Sqrt[4 Pi t])) * Exp[ x^2/(4 t)], {x, 2}]
 one year ago

modphysnoob Group TitleBest ResponseYou've already chosen the best response.0
./ is not used in mathematica, it is matlab notation
 one year ago

liliy Group TitleBest ResponseYou've already chosen the best response.0
./ i was just trying to make the whole thing into a number so i tried to multiple (dividde) by 1. lol
 one year ago
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