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  1. cubsfan334

    Recursion?

    I'm not sure about the first code you posted, but I don't think the 2nd and 3rd will work. I think those simply plug n in for t and solve. What I need is the result for t=2 is dependent on the result of t=1, and the result of t=3 depends on the result of t=2, etc If that makes sense.
  2. cubsfan334

    Recursion?

    Hi, I have one more question: How would I make a recursive function? For example I could have these equations: a1 = (x1 - x2) * t a2 = (y1 - y2) * t x1f = 5 * a1 y1f = 5 * a2 I need a do loop that will calculate x1f and y1f when t=1, then plug in the previously generated xf1 for x1 and yf1...
  3. cubsfan334

    Do Loops -- Real Step Size

    Thanks for the responses guys, I had another question also -- I set a parameter for g, the gravatational constant = 6.673E-11. When I execute my program, however, I believe that the program rounds this to 0. Also, the output numbers are also rounded to whole numbers -- I need decimal places...
  4. cubsfan334

    Do Loops -- Real Step Size

    Hi, I'm new to Fortran and I'm running into trouble with do loops. I keep getting the error that the step size can only be an integer. I'd like to use a step size of .01 or .001. Why is this, and is there a way around it? Thanks, cubsfan

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