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liliy

  • one year ago

DOES ANYONE KNOW MATHEMATICA?????

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  1. modphysnoob
    • one year ago
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    YES

  2. modphysnoob
    • one year ago
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    what's your question , sailor?

  3. liliy
    • one year ago
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    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

  4. liliy
    • one year ago
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    i got the value for dp/dt with the function :pt = D[(1./(Sqrt[4 Pi t])) Exp[ -x^2/(4 t)], t]

  5. liliy
    • one year ago
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    but my second derivative of dx gives me 0.

  6. liliy
    • one year ago
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    dx = D[(1./(Sqrt[4 Pi t])) Exp[ -x^2/(4 t)], {x, 2}] is there soemthign wrong with my equation?

  7. liliy
    • one year ago
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    :(

  8. modphysnoob
    • one year ago
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    so are you trying to solve differential equation or take second derivative?

  9. modphysnoob
    • one year ago
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    second derviative goes like this D[ Type function here ,{x,2}]

  10. liliy
    • one year ago
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    ya thats what i did

  11. modphysnoob
    • one year ago
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    D[(1./(Sqrt[4 Pi t])) * Exp[ -x^2/(4 t)], {x, 2}]

  12. modphysnoob
    • one year ago
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    ./ is not used in mathematica, it is matlab notation

  13. liliy
    • one year ago
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    ./ i was just trying to make the whole thing into a number so i tried to multiple (dividde) by 1. lol

  14. liliy
    • one year ago
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