Recent content by JorgeM

Thanks a lot . Actually I have already checked all the tutorials. But among all that example codes, none of them uses the functions I menctioned. And I suppose there is a way to implement them, or use them from an standard c library because the code compiles... but doesn't calculate anything...

I would like to know if some of you have ever used it. Because I have had really simple questions for solving, but there is not a really wide number of users and I'm afraid I won't be able to solve my system... unless I knew how to implement some functions... If you could share with me how to...

I got a polar function. $$ \psi = P(\theta )R(r) $$ When I calculate the Laplacian: $$ \ \vec \nabla^2 \psi = P(\theta)R^{\prime\prime}(r) + \frac{P(\theta)R^{\prime}(r)}{r} + \frac{R(r)P^{\prime\prime}(\theta)}{r^{2}} $$ Now I need to convert this one into cartesian coordinates and then...

$$ \lim_{x \to 0} [ \frac{J_{p}(x)}{Y_{p}(x)} ] $$

I was just thinking on the fact that there are some comercial gas masks . These ones have a filter, that doesn´´´'t let the Hydrochloric acid gas molecules to go into the mask. This is the way it basicly works, isn't it? So this filther has some little holes that are smaller than these...

The Schrödinger equation I need to prove is this one And the Gaussian wavepacket is found here Thanks for your advice. JorgeM <Moderator's note: upload images to PhysicsForums. Do not use external image servers.>

Yes, actually the footnote reffers to a GNU statistics library which instructions are not still available. Can you please recommend me some bibliography to find out which is the best option (formula) that I may use to analize my data (The data is about stocks' prices)

The expression I have found is this one. https://ibb.co/kqG24L3 I have been looking for information because I could not to realize what is the value that "alpha" has to have. If any of you do know what this alpha value is supposed to represent or if you have seen it before I would be really...

I started to read a lot about the different methods for solving this problem. I think I'm going to use the one that requires Marcov's chains. Thanks a lot

Actually, that is the correct result. Thanks a lot for your reply

The only restrictions are: -There are N points randomly distributed over an X-Y plane and it is necesary to pass every point at least 1 time, in order to get the path of the minimun distance throught all of them. -If does not matter how many times you pass any of this points. -You have to pass...

.

I have taken a look but most books and Online stuff just menctions the First order Taylor for 3 variables or the 2nd order Taylor series for just 2 variables. Could you please tell me which is the general expression for 2nd order Taylor series in 3 or more variables? Because I have not found...

Nothing really, I figured out how to use Latex, so I started to try to write equations and symbols. However, I have finally written the equations as good as possible in order to make people easy to understand. But I do not know if what I have made is well-solved. Thanks.

I have to integrate this expression so I started to solve the delta part from the fact that when n=0 it results equals to 1. And the graph is continuous in segments I thought as the sumation of integers $$ \int_{-(n+1/2)π}^{(n+1/2)π} δ(sin(x)) \, dx $$ From the fact that actually $$ δ(sin(x))=...