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  1. J

    LaTeX Particular environment LaTeX help

    :!!) Exactly what I needed! Thank you!
  2. J

    LaTeX Particular environment LaTeX help

    Call me lazy, but I'd like to make a new command to quickly display a norm, something like \newnorm{x+y} (to display \|x+y\|), whether I'm in the math environment or not.
  3. J

    LaTeX Particular environment LaTeX help

    You're right, perhaps that was not very clear. I want to be able to tell if an environment is in use in a certain area during compilation. Something that may return a boolean, to be used with some other package (I believe there is a if-then package or something like that... right?).
  4. J

    Help With a driver problem.

    Maybe you could give DOSBox a try?
  5. J

    LaTeX Particular environment LaTeX help

    Hmmm... I don't think I understand how this command can help me finding out if the math environment is in use or not...
  6. J

    LaTeX Particular environment LaTeX help

    Hey all! I'm trying to learn \LaTeX, and so far I'm doing fine. However, I would like to know if it is possible to be able to find out if a particular environment is in use at a certain point. Basically, I was wondering if something like: \isInUse{math} exists in LaTeX. Does anyone...
  7. J

    MATLAB Matrix of ODE's in MATLAB

    :shy: Why on earth didn't I think of that? You can't possibly imagine how much that just helped me! Thank you very much!!
  8. J

    MATLAB Matrix of ODE's in MATLAB

    Hey all, Consider the system X' = f(X), where X is a square matrix. I would like to solve this system with MATLAB, but all of its solvers require X to be a column vector. Of course, it would be possible to rewrite X' and f(X) as column vectors, but I guess some efficiency would be lost. It...
  9. J

    MATLAB (MATLAB) Ignoring output arguments

    Hey all, Suppose I have a MATLAB function that returns two (or more) output arguments, but I only care about the second one, and I do not wish to assign the value of the first one to a variable. What bugs me is when, for example, I solve an ODE: [t, x] = ode45(blablabla) and then...
  10. J

    Fourier transform -> power spectrum

    Thank you both for this enlightment! I believe I understand much better now. Ah, well, no I didn't :shy: I should have mentioned that I'm studying maths and not physics. Thanks again!
  11. J

    Fourier transform -> power spectrum

    Fourier transform --> power spectrum Hey all! I've been learning about the discrete Fourier transform (and FFT too) recently. What I don't understand is why applying it to a signal gives its power spectrum. I am not really good in physics, so to me it just seems like a magical formulae, one...
  12. J

    Math Computer Program?

    I really like Maple, but I believe the softwares others have just mentioned will do the job for the use you're looking for.
  13. J

    I love geometry

    Yeah, I've done all that stuff. Anyway Maple is here to help me :D Are you sure b = angle ACE? It's angle CHJ on your diagram. Anyhow, I'm not sure I get that: AC = HJ.tan(b) + HJ/tan(b) + x.tan(b) + x.tan(60°). You're adding all the parts of the AC segment, right? In other words, CJ +...
  14. J

    A shorter proof to 0.999 = 1

    This is perfectly right. I don't know if there's a "shortest proof", but your friend's certainly is short. I'm somehow a newbie here, but I used to visit Tom's Hardware Guide's forums, and there's an interesting topic with... various "opinions" on the subject on it. Check it out...
  15. J

    I love geometry

    Yup, you're certainly right, because AB is on the right bisector of the circumscribed triangle... Now I was thinking of finding some sort of relation between the distance AG and the radius of the circle, but since AG isn't really defined, I don't see what we could get out of it. I also...
  16. J

    Simple Logs

    Actually, once you've got 2 = x^9, all you've got to do is \sqrt[9]{2} = x = 1.080059739. I don't think it's really trial and error; had it been 31 or 33, the answer wouldn't have been an integer. "Luckily", \sqrt[5]{32} = 2.
  17. J

    I love geometry

    I don't really know if we have to find it, but we sure don't have it... You're probably right about the center after all, it seems we can't get the radius otherwise.
  18. J

    I love geometry

    The circumscribed circle is formed by the intersection of the right bisectors of the sides of the triangles. I had no idea about its radius, but after a quick search on google I found that it's something like abc/4A, where a,b,c are the lenghts of the sides of the triangle, and A its area. I...
  19. J

    I love geometry

    I love geometry :) Hey all! This is one problem I haven't been able to solve. I've had a class on theorems relative to circles and triangles but I still can't figure this one out. 3 identical, equilateral triangles are placed as seen on the attachment. Their sides measure 28cm, and the...
  20. J

    Maple Maple, anyone?

    Man, I didn't know about that D operator, the only thing I used was diff. Your help is extremely appreciated. Thanks a bunch both of you!! See my appreciation in the attachment! :smile:
  21. J

    Maple Maple, anyone?

    Hey all, I'm having trouble setting initial conditions when solving differential equations in Maple. Here's the equation: \theta(t)''+4\pi^2 sin(\theta(t))=0, with \theta(0)=A and \theta'(0)=B as initial conditions. I'd like to solve it with a command like...
  22. J

    Simple pendulum help

    Thank you both for your help! Yeah, the solution I got is different because there is possibly a value greater than zero for \theta'. My initial conditions are: \theta(0)=A and \theta'(0)=B. I am asked to find the amplitude and period of oscillation in function of A and B...
  23. J

    Simple pendulum help

    Hey all, I'm a math students, and I've got physics homeworks to do, and... I need some help :smile: To make it short, I solved the approximation of the differential equation of the angle of a pendulum in function of time, and I got this...
  24. J

    A little geometry

    Thank you everybody for your help, every advice was very helpful. :D
  25. J

    A little geometry

    Well, I have to prove that if one of the two (the 90° angle or the lenght that is half the lenght of the hypotenuse) is true, then the other is too.
  26. J

    A little geometry

    Hi all, I'm having a hard time proving something. Let's say you have a triangle with a 90° angle. How can I prove that the lenght of the segment between the middle of the hypotenuse and the 90° angle is half the lenght of the hypotenuse itself? Here's a little pic to help you... Thanks...
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