# Cola

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Question

How to introduce a constriant and stop condition in ode45 ？

There are two questions. The first question is how to introduce a constriant in ode45 for a variable. For example, the constr...

6 månader ago | 2 answers | 0

### 2

answersQuestion

How to deal with the time response of first order system?

There is a system of differential equations: x'=ax+by, y'=cx+dy, where tau*a'+a=a*. I used to deal with the time response tau...

7 månader ago | 1 answer | 0

### 1

answerQuestion

How to deal with the connection between symbolic caculations and numerical caculations?

First I need to do symbolic calculations to get the required equations. Then I use the equations for numerical calculations. F...

8 månader ago | 2 answers | 0

### 2

answersQuestion

How to calculate the norm of the transfer function in frequency domain?

To calculate the norm of the transfer function by substituting s=jω is troublesome, especially for some complicated transfer fun...

9 månader ago | 2 answers | 1

### 2

answersQuestion

How to calculate the area of the curve around a point?

There is a curve, and the coordinates of each point of the curve is known. Is there a way to calculate the area of the curve aro...

ungefär ett år ago | 1 answer | 0

### 1

answerQuestion

How to analyze and evaluate a system of differential equations without equilibrium points?

There is a system of differential equations containing more than two variables, and the differentials of the variables cannot al...

ungefär ett år ago | 0 answers | 0

### 0

answersQuestion

Can Ode 45 solve piecewise function in the iteration？

In the iterative process of Ode45, the variable values change with time. The relationship between variable values corresponds t...

ungefär ett år ago | 1 answer | 0

### 1

answerQuestion

How to store conditional values during iteration by using Ode45?

I want to store data of each iteration, including the conditional values. Is there a way to do this? Thanks! There is an exam...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

Can a system of differential equations have a solution when the rate of change of a variable is constant? And how to calculate it?

There is a system of differential equations containing more than two variables, and the rate of change (with time) of one of the...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

How to solve a complicated equation?

There is a Equation G. How to obtain the values of α and β when G=0？ G=-(-Omega^3*tau + (alpha + beta)*Omega)^2 - (Omega^2 - al...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

How to plot the phase plane for a system with three degrees by using streamslice?

For a system with 2 degree, we can use steamslice to plot phase plane. e.g： ODEs dx/dt=x^2-2x-xy; dy/dt=y^2-4y+xy; Ma...

mer än ett år ago | 0 answers | 0