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Cola


Last seen: 5개월 전 |  2021년부터 활동

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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...

거의 2년 전 | 답변 수: 2 | 0

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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...

대략 2년 전 | 답변 수: 1 | 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...

대략 2년 전 | 답변 수: 2 | 0

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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...

대략 2년 전 | 답변 수: 2 | 1

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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...

2년 초과 전 | 답변 수: 1 | 0

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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...

2년 초과 전 | 답변 수: 0 | 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...

2년 초과 전 | 답변 수: 1 | 0

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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...

2년 초과 전 | 답변 수: 1 | 0

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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...

2년 초과 전 | 답변 수: 1 | 0

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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...

거의 3년 전 | 답변 수: 1 | 0

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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...

거의 3년 전 | 답변 수: 0 | 0

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