xiongxin9000

Hi I have a question that when I use matlab with xlim and ylim, the display is alright but the actual data is not removed and then when i do...

question about second-order ode identification

11

Hi, I would like to identify second-order ode below: $$(R 1)^{\prime}=1.000 R 2 $$ $$ (R2)' = \frac{3.6521}{R_1 \cdot \ln\left(\frac{1}{R_1}\right)} + \frac{0.0051}{R_2 \cdot \ln\left(\frac{1}{R_2}\right)} - \frac{34.8451}{R_1^{2} \cdot \ln\left(\frac{1}{R_1}\right)} + \frac{339.376...

polynomial library to include second order derivative

2

Hi, I'm trying to reproduce a second order ode with polynomial library. I am struggling adding the second order derivative in the second equation. How can I achieve this by...