Recent content by Sonolum

Soooooo... I think we might have a solution, though I'm still working out all the details on Matlab... We're trying to use the surface fitting tool to fit to both functions. I will update this thread as soon as I get it working with better instructions! Best wishes, and if you figure...

I think you may be onto something here! I have been trying to write an if/else loop to create the two functions to fit to, which MatLab seems to vehemently dislike. Phrasing the problem in the manner you've suggested makes it a minimization of a matrix problem, instead of an lsqcurvefit...

Okay, here's a problem that I've been struggling with for a few weeks. I'm conducting a series of measurements, where I get two sets of data, i.e. one xdata value gives me two ydata values. I want to curve fit the two data sets to two different functions, F1 and F2, that depend on the same...

Thank you!

I am unsure where to post a question regarding how to do something in Matlab... I know that is a bit cryptic, but I'm trying to only ask WHERE I should post the question, and not ask the question itself in this forum. Because it is not a homework question, and also because it concerns computer...

Should be: f''''(0) = -6/(1+0)^4 = -6 And that resolved the problem! Excellent, thank you for finding my error! ^_^

Hang on, I'm still having a problem, can someone help? I'm getting: f(0) = ln(1) = 0 f'(0) = 1/(1+0) = 1 f''(0) = -1/(1+0)^2 = -1 f'''(0) = 2/(1+0)^3 = 2 f''''(0) = -3/(1+0)^4 = -3 (and so on...) I can't quite figure out how to get it into the form sum(n=1 to infinity) [(-1)(n-1)...

Oh, wait... No chain rule, neh? Thanks for this link: https://www.physicsforums.com/showthread.php?t=111961, it's the same thing! ^_^

So is it blandly: f(z) = sum (n=0 to infinity) zn{f(n)(0)}/{n!}?

Yes, I realize that. in this case, f(z)=ln(1+z), f'(z) = (1+z)^(-1)*z', f''(z) = -(1+z)^(-2)*z' + (1+z)^-1*z'', by the chain rule, right? I understand the notation... But how is it that I "develop" the expansion?

Homework Statement Develop the Taylor expansion of ln(1+z). Homework Equations Taylor Expansion: f(z) = sum (n=0 to infinity) (z-z0)n{f(n)(z0)}/{n!} Cauchy Integral Formula: f(z) = (1/(2*pi*i)) <<Closed Integral>> {dz' f(z')} / {z'-z} The Attempt at a Solution I have NO idea...

Yep - between the capacitor plates, the electric field adds!

Should be: E = (q/A)/Eo ^_^

Okay, let me try again... What's the frequency when you're aproaching the siren? What's the frequency when you're going away from it? The difference in frequency should be between these two numbers, I think... Basically, try for something like [ F(approaching) - F(going away) ] = 97 Hz

Awesome! Physics Rules!