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Math Help - mathematica help!

  1. #1
    Newbie
    Joined
    Feb 2010
    Posts
    6

    Red face mathematica help!

    hi everyone,
    i use mathematica for analysing data, i have a list {(v0,io),(v1,i1),(v2,i2)....(vn,in)} and i want plot dv/d(lnI). vs. i,
    what i do to calcul dv/d(lnI)
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  2. #2
    Super Member
    Joined
    Aug 2008
    Posts
    903
    How about this:

    Code:
    (* Create table of {{vn,in}} test values *)
    mytable = Table[{n, n}, {n, 1, 10}]
    
    (* switch the {v,i) to {log[i],v} *)
    newtable = {N[Log[#[[2]]]], #[[1]]} & /@ mytable
    
    (* calculate interpolation function of the list {log (i),v} *)
    myfunction = Interpolation[newtable]
    
    (* calculate the derivative dv/d log (i) *)
    
    mydev[t_] = D[myfunction[t], t]
    Plot[mydev[t], {t, 1, 10}]
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  3. #3
    Newbie
    Joined
    Feb 2010
    Posts
    6

    Red face

    i do what u say, and i want plot dv/d(lnI). vs. I,
    what i do now boss
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