Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Problem differentiating exponential function in Maxima

  1. Jul 18, 2009 #1
    Hey everyone, I'm new to using the Maxima software and I'm having some trouble. When I enter the following formula to be evaluated:

    diff(1-exp^(-t/R*C),t);

    I get the following output:

    [tex]\frac{log\left( exp\right) \,C}{{exp}^{\frac{t\,C}{R}}\,R}[/tex]

    This doesn't look right, even if I simplify the numerator. Am I doing something wrong?
     
  2. jcsd
  3. Jul 18, 2009 #2

    f95toli

    User Avatar
    Science Advisor
    Gold Member

    No, it is correct.
    At least if log(exp) really means ln(e^1)

    I think you are confused by the fact that you've (presumably) forgotten to but parentheses around the RC factor, 1/R*C=C/R not 1/(R*C).
     
  4. Jul 19, 2009 #3
    Yes, that's the problem. I swear parenthesis and order of operations are going to be the death of me; I once took a course in Lisp. I still have nightmares. From what I understand, Maxima is written in and programmed by using Lisp. :cry:
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Problem differentiating exponential function in Maxima
  1. Exponential function (Replies: 7)

  2. Exponential functions (Replies: 2)

Loading...