Recent content by bangthatdrum

oh ok, thanks 4 the help.

Hi ! What does the notation mean exactly when a function has power minus one ? For example i have seen the logistic function written as: f(x) = f0[1 + exp(−βx)]^-1

Thanks, its a conundrum alright. This is implemented in: http://www.physik3.gwdg.de/tstool/ and it seems strange that such an elementary mistake would be made.

http://anythinghere.comeze.com/slope.png The slope is supposed to be 0.16 but that's not what i get. Can someone else please confirm i am not going nuts?

the khan academy provides a good overview

http://tutorial.math.lamar.edu/Classes/LinAlg/SolvingSystemsOfEqns.aspx i would use a MATLAB script for this.

Greetings all, I hope someone out there in the vast hinterland of the internet can help. I'm trying to calculate the lyapunov exponent for a system of differential equations. Now I can do this just fine for a system involving only first order derivatives such the Lorenz system, however, and...

Thank you D H. This is wonderful.

Please ignore this.

Im looking at the RK derivation and as part of that I know it is the case that: y'' = partial f / partial x + partial f / partial y * y' But at an intuitive level I cannnot understand why. How does the second derivative equal the sum of the two partial derivatives times the first?