Recent content by glamotte7

Bill, OK. Thanks very much for the code. I'll try working with it as you recommended, very simple things first. I'll check Matlab to see if they describe their approach elsewhere or what their exact code is. It didn't come up readily but maybe I can find it with more digging around...

Hello Bill, I've carefully read the article you suggested which is not entirely, but a bit, over my head. I am new to DSP and so am trying to gain my footing. I'm sure that equation (5) of the paper you referenced would be an excellent approach. I'm not at all sure where to begin to write...

Hello, Does anyone know how to calculate a power spectral density from discrete data using Welch's method with Mathematica? Matlab readily does this but I need to do it with Mathematica. Any guidance would be appreciated. glamotte7

Thanks Bill, Actually the point of the work I'm doing is to redo solutions to problems using Mma that we already have the solutions for using Matlab. glamotte7

Bill Simpson, Thanks so much. Really glad to have that method in my back pocket now. I'm just getting started with doing digital signal processing work with Mathematica. Have seen similar work done with MATLAB. I need in particular an easy method to do Fast Fourier Transforms, perform a...

Hi phyzguy, That worked great! Another related question if I may: I wish to add 2 of these tables together to get a new table. Each table has 2 columns. I want the 2nd columns (the Y columns) to add together in the usual way. I want the 1st columns (the X columns) to each be...

Hi, Have a problem: I'm generating 2 lists in Mathematica: In: time = Table[(r - 1.0)/10.0 , {r, 10}] Out: {0., 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9} In: noise = Table[RandomVariate[NormalDistribution[0, 1.4], 10]] Out: {2.16764, -1.38203, -0.395928, -0.58616...

Are you aware of a basic review article or reference on Nordstrom's scalar theory, accessible online?

Also, in Nordstrom's scalar theory, can't the scalar conformal factor be multiplied in an unequal fashion times -dt,dx,dy and dz? For example, can't dy and dz remain multiplied by 1 rather than multiplied by the factor, which in this case the factor would only affect dt and dx?

For small ∅ this would be 1 + (2∅), correct? What does the word conformal factor mean? Why is it advantageous to use an exponential as opposed to some other function? I've seen other important GR equations solved beginning with an arbitrary exponential. Why is this the best approach for a...

Hello, I'm trying to find a table of basic connection coefficients. My GREAT desire is to find a table that includes the metric, connection coeffs, Riemann tensor, Ricci tensor and Ricci scalar for NORDSTROM's 1913 scalar theory of gravity. Does anyone know an online source of this info...

Thanks atyy---I took a look. Unfortunately the class doesn't start until Feb 2011 so I won't be able to do it this fall. Thanks xepma---I took a look at PIRSA. The lectures by Myers on GR are at just the level I'm at. You said that's it's possible to "take the whole course". Does that...

Hello All, I have an undergrad physics degree. I've been studying GR on my own for a while, including Hartle, Schutz, Carroll, etc. There is NO GR course offered this fall in the state of CO, which is where I live. This fall I'd like to take a real ONLINE class in beginning GR included...

I wish you the best. I'm trying hard too.

Thanks Nabeshin Any other suggestions anyone?