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liliy

DOES ANYONE KNOW MATHEMATICA?????

  • 11 months ago
  • 11 months ago

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  1. modphysnoob
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    YES

    • 11 months ago
  2. modphysnoob
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    what's your question , sailor?

    • 11 months ago
  3. liliy
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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

    • 11 months ago
  4. liliy
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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]

    • 11 months ago
  5. liliy
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    but my second derivative of dx gives me 0.

    • 11 months ago
  6. liliy
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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?

    • 11 months ago
  7. liliy
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    :(

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

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

    • 11 months ago
  10. liliy
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    ya thats what i did

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

    • 11 months ago
  12. modphysnoob
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    ./ is not used in mathematica, it is matlab notation

    • 11 months ago
  13. liliy
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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

    • 11 months ago
  14. liliy
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    • 11 months ago
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