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Relations between Function Variables in Computations

Discussion in 'Mathematics' started by Wasserwaage, Oct 8, 2018.

  1. Wasserwaage

    Wasserwaage Guest

    I have the relation λ=c/f, respectively f=c/λ and a simple function n[λ_]:=λ²+1. I'd like to differentiate the function with respect to f, then plot it as a function of λ again. For this, I can define the function


    I can now compute

    D[n[c/f], f]

    To get that as a function of λ, I tried

    nplot[f_]:=D[n[c/f], f]

    (which does not work) and then


    Is there no elegant way to switch between λ and f in plotting and computing - such, that I could just say



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