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Cola


Last seen: 8 meses hace |  Con actividad desde 2021

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Estadística

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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...

alrededor de 2 años hace | 2 respuestas | 0

2

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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...

más de 2 años hace | 1 respuesta | 0

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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...

más de 2 años hace | 2 respuestas | 0

2

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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...

más de 2 años hace | 2 respuestas | 1

2

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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...

casi 3 años hace | 1 respuesta | 0

1

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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...

casi 3 años hace | 0 respuestas | 0

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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...

casi 3 años hace | 1 respuesta | 0

1

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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...

casi 3 años hace | 1 respuesta | 0

1

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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...

casi 3 años hace | 1 respuesta | 0

1

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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...

alrededor de 3 años hace | 1 respuesta | 0

1

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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...

alrededor de 3 años hace | 0 respuestas | 0

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