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ARGH Matlab trouble

  1. Oct 10, 2004 #1
    ARGH!!! Matlab trouble!!!

    Ok, I'm having a big problem as described here: https://www.physicsforums.com/showthread.php?t=46950

    Basically, I've never used matlab and was given an assignment on friday which requires that I use matlab. First off, could someone please help me with my projectile problem?

    Next, how the heck does one write an m-file. I know how to open the editor and the simple stuff but actually using ODE45 is killing me. The help file is about as useful as a man file--good for pro's lousy for novices.

    Any help would be greatly appreciated.
     
  2. jcsd
  3. Oct 14, 2004 #2
    If you haven't already figured it out, there's nothing much to an .m file. Since i do not warez matlab, i'm using vim (a text editor) and octave. Basically what goes in a .m file is something like this
    Code (Text):

    function returnValue = f(x)
         returnValue = 2*x^2 + 3*x+2
    end

    format long %for displaying more digits
    result1 = f(4)
    results = zeros(1,10); %creates a vector full of zeros, 10 big
    results(1) =  f(6);
    results(5)  = f(24);
     
     
  4. Oct 21, 2004 #3
    Dont know about the projectile project but with the m - file i could help...
    open a new m-file which can be found in File, then New... after which click on M-file...

    Here u type in your code... when your done save it and give it a name (obviously... hehehe) now u can call your M-file from the command window in the main page...

    however, if u want to make your own functions, wherein a created m-file will act like a regular function in matlab... all the functions in the matlab library have m-files as well... search for function in help to get details... to see what im talking about type this: type specgram

    upon pressing enter, the entire code will come up... thats basically the same thing u need to do... the help for function is fairly easy to use...

    hope i helped! Ü
     
  5. Oct 21, 2004 #4
    Here's an example of an m-file i made

     
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