# Cola

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Question

How to introduce a constraint and stop condition in ode45 ？

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

mer än 2 år 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...

mer än 2 år 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...

mer än 2 år 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...

mer än 2 år 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 3 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 3 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 3 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...

ungefär 3 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...

ungefär 3 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 3 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 3 år ago | 0 answers | 0