Numerical Methods for Ordinary Differential Equations: Butcher/Numerical Methods

Numerical Methods for Ordinary Differential Equations: Butcher/Numerical Methods
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DOI:
10.1002/0470868279
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发表时间:
2005-01
期刊:
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影响因子:
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通讯作者:
Branislav @. Nikoli
Branislav @. Nikoli
中科院分区:
其他
文献类型:
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作者:
Branislav @. Nikoli

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并且在每种情况下,应该通过xlabel、ylabel和legend来标记轴和曲线。现在可以使用不同的时间跨度、初始条件和参数进行实验(目前仅为a)。作为第二个例子,我们通过函数dx = switch 29(t,x)dx(1,1)= x(1)− x(1)2− 2 <$x(1)<$x(2); dx(2,1)= x(2)− x(2)2− 2 <$x(1)<$x(2)来编码290页上方程29中的分子开关;为了更好地理解ode 23是什么,我们现在开始我们自己的近似方案。这实际上只是回到了课程的早期部分,因为我们将用差分方程x1(tn+1)-x1(tn)dt = x1(tn)-x 3 1(tn)-ax 2(tn)x2(tn+1)-x2(tn)dt = x1(tn)-x2(tn)(2)
and in each case one should label the axes and curves via xlabel, ylabel and legend. One may now experiment with different time spans, initial conditions, and parameters (just a for now). As a second example we encode the molecular switch in equation 29 on page 290 via function dx = switch29(t, x) dx(1, 1) = x(1) − x(1)2− 2 ∗ x(1) ∗ x(2); dx(2, 1) = x(2) − x(2)2− 2 ∗ x(1) ∗ x(2); To better appreciate what ode23 is up to we now embark on our own approximation scheme. It is really just a step back to the early part of the course, for we will replace the differential equation, (1), with the difference equation x1(tn+1) − x1(tn) dt = x1(tn) − x 3 1(tn) − ax2(tn) x2(tn+1) − x2(tn) dt = x1(tn) − x2(tn) (2)