Recent content by TaylorLL

WAIT, wow, that was a stupid integration mistake. This $$-kln\left(m_{o} - kt'\right)|_{0}^{t} = -bln\left(kv_{ex}-bv'\right)|_{0}^{v}$$ should have been $$-\frac{1}{k}ln\left(m_{o} - kt'\right)|_{0}^{t} = -\frac{1}{b}ln\left(kv_{ex}-bv'\right)|_{0}^{v}$$

Okay, so here's my integration: $$\int_{0}^{t} \frac{dt'}{m_{o} - kt'} = \int_{0}^{v}\frac{dv'}{kv_{ex}-bv'}$$ $$-kln\left(m_{o} - kt'\right)|_{0}^{t} = -bln\left(kv_{ex}-bv'\right)|_{0}^{v}$$ $$-kln\left(\frac{m}{m_{o}}\right) = -bln\left(1 - \frac{bv}{kv_{ex}}\right)$$...

Homework Statement Consider a rocket subject to a linear resistive force, $$f = -bv$$, but no other external forces. Use Equation (3.29) in Problem 3.11 to show that if the rocket starts from rest and ejects mass at a constant rate $$k = -\dot{m}$$, then its speed is given by: $$v =...

Okay! I figured it out (thanks to looking over the documentation again haha). When using nlinfit, the test function can only take TWO inputs: a vector containing the coefficients, and the independent variable. Here's my working code: %Test function t = t'; y = y'; test =...

I've already looked at the documentation and I've done examples in class. I cannot see where my error is coming from. EDIT: Sorry for being snippy, thank you!

Error using nlinfit (line 205) Error evaluating model function '@(t0,k,phi)(t-t0).*sin(k.*(t-t0)+phi).*(t>=t0)+(t0).*sin(k.*t0+phi).*(t<t0)'. Error in HW6_Part2_Lonner (line 28) coef_inv = nlinfit(t,y,test_fcn,guess); Caused by: Not enough input arguments.

nlinfit is a function from the statistics toolbox offered by Matlab. The anonymous function is the "test" function. EDIT: I realize my phrasing was confusing, but it was a list of three separate things.

Hello! I'm trying to plot a best fit for some generated EQ data and I'm having issues with nlinfit. My code is as follows and when I try to run it, I get an error referring to the anonymous function ("test"), nlinfit (from Matlab), and not having enough input arguments. %Test function t =...