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

Reliability of Mathematica

  1. Oct 14, 2004 #1
    Recently I was doing some calculations with Mathematica then I did it on paper and the results weren't the same. I am almost sure I didn't make any mistake. I study electrical engineering and we have to do a lot of calculations. I have used Matlab and Mathematica for calculations with symbols. Until now I haven't done much complex calculations with Mathematica. Does anyone know if Mathematica is 100% reliable for every equation or is it only a tool for simple equations?
  2. jcsd
  3. Oct 14, 2004 #2
    In short, yes, it is correct 100% of the time I would say. If it wasn't there would be no use for it. I use it all the time and it can out-math pretty much anything out there, it is a computer program after all, its job is to do math calculations.
  4. Oct 14, 2004 #3


    User Avatar
    Science Advisor
    Homework Helper

    I haven't used Mathematica very much but I've never had Maple screw up and I'd wager Mathematica is quite reliable.

    There is a disclaimer though, these programs will be able to reliably perform any computation that you tell them to perform. Make sure you're actually telling it to do what you think you're telling it to do. They aren't free of user error.
  5. Oct 14, 2004 #4


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Mathematica, MATLAB, and other CA systems will sometimes disagree when doing really, really intensive tensor-calc problems with lots of ODEs. The ODE solvers are not always perfect, but are, well, virtually always right.

    If you're doing some simple EE work, and your pencil-and-paper solution doesn't match Mathematica's solution, it's almost surely your error. Check your pencil-and-paper work, then check to make sure you accurately supplied the problem to Mathematica.

    - Warren
  6. Oct 14, 2004 #5
    They wouldn't release it if they knew that it wasn't 100% reliable. Even if it was 99%, I doubt they would.

    I think you may have done something wrong when you did it on paper. Double check it.
  7. Oct 14, 2004 #6
    Thank you.
    Maybe the result isn't different but it isn't simplified. I am sure I haven't done any error with my calculations.
    Something that also seems strange is that Mathematica gave the result in note like this:
    Sqrt[a^2......] I have put FullSimplify command but it hasn't changed. Anyone knows why?
  8. Oct 14, 2004 #7


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    You might want to use an ExpandAll followed by a FullSimplify.

    - Warren
  9. Oct 15, 2004 #8
    It still doesn't work.
    I get this result:
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Reliability of Mathematica
  1. In mathematica (Replies: 4)

  2. Mathematica and Sums (Replies: 4)

  3. Mathematica Sums (Replies: 6)

  4. Mathematica NDSolve (Replies: 27)