Recent content by Littlepig

Hi there. We know that Convolve[f,g,x,y] = f[y] if g = diracdelta. My question is, what should be g so that Convolve[f,g,x,y] = f[y1] where y1 is a parameter of the g function. I.e. Is there any function g such that, when convolved with another f, gives the evaluation of f on a given point?

Hi there. I was recently working out some expressions in Electro-Dynamics, to calculate reflexion and transmission coefficients. Ok, I reach some Fresnel equations. However, real materials are not so perfect, in sense that they are perfect surfaces, with perfect everything. So, I wonder how...

I there. I'm currently using this kind of integrals, with n even, and I couldn't found anything in internet for calculate this. Let From the book I'm studying Ashcroft/Mermin, Solid State Physics, Append C, it says that a_{n}=\int_{-\infty }^{\infty } \frac{x^n e^x}{\left(e^x+1\right)^2}...

bump, At least give me a name of a book to search on...xD please...

I advise you to read, for instance, An introduction to Error Analysis; Taylor, Jonh R.; University Science Books; 1997 It gives you nice ways of understanding the fit problem

I agree I don't agree and I counter example with this: assume: Example 1: x_1=15, delta x_1=0.2 x_2=9, delta x_2=0.1 x_3=3, delta x_3=0.2 Example 2: x_1=9.2, delta x_1=0.2 x_2=9, delta x_2=0.1 x_3=8.8, delta x_3=0.2 By your method, both mu and sigma are the same for both...

Homework Statement Suppose I have N x_{i} measures with a given uncertainty \Delta x_{i}. I want to have the best estimate for \bar{x} and its uncertainty \bar{\Delta x} 2. Homework Equations /3. The Attempt at a Solution Well, I'm not exactly sure because or I can have a mean...

Suppose the example: model = a^b*t^2+i a^2*b*exp[t] where (t,a,b in real) data= {{t,x(t)+y(t) i},...} where y and x are real (data is the experimental data...numbers...) FindFit[data,model,{a,b},t] Thanks, it's a possible solution...:p

Have exactly the same problem here... With the same error...

I think we can assume this code is linear. So, what you have to do is: For[i = 1, i <= 10000, i++, If[i == x, Print[i]]] Where x is (10000/47888755100)*47888755200. Count the time with a function that gives you the time it takes, the time for your computation would be something like...

Hi there Suppose I have data of the format {x,y+i z} where x,y,z is real and i is the imaginary unit. I'm trying to make a FindFit of some nasty model that, suppose for simplification is f(x) = a^b*x^2+exp(a)*b*i*x (domain is real, codomain is complex and a,b are Real) and can be written...

Like for instance Jackson for electrodynamics. It may be a little more difficult because the things are made in a good mathematic base with formal language. Thanks for the quick response. :)

Hi there, I'm searching for a good book for statistical physics. Professor as told us that the bibliography was Reif or Kittel (thermal physics) However, both are a little bit old, and some not very formal. I'm wondering if something more formal, more recent, with more or less the same...

Yeah, you are right..xD i must then reformulate my problem...xD Tk U very much

hi there. I'm having some problems with Center Mass calculations... I have a CM moving at x-axis with Vx, and it as a mass of M. Now, assume CM is made of n particles, but i only know their masses(all equal m), not their speed. My problem is how do i find their velocities? By Energy and...