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.
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?).
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...
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...
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...
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!
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...
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 +...
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...
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...
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.
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.
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...
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...
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:
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...
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...
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...
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...