other variable inside odesolver

Question

pawan kumar 2011-11-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/20618-other-variable-inside-odesolver

采纳的回答： Jan

i have these set of equation

k = (c(1)+c(3))/2

value = [c(2); -k*(c(2)-w1)^2; c(4); (-k*(c(2)-w1)*(c(4)-w2))-g; c(6); -k*(c(2)-w1)*(c(6)-w3)];

i am solving this equation using ode45

[t,c] = ode45('wind',tspan,c0,w1,w2,w3); at the end of solution it gives value of t and c. but value of k is also changing with c(1)& c(3) at each step .i want the matrix of k also. how to get the matrix of k

thanks pawan kumar

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Answer 1

Jan 2011-11-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/20618-other-variable-inside-odesolver#answer_27227

What about using "k = (c(:, 1)+c(:, 3))/2" to calculate the value of k afterwards?

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pawan kumar 2011-11-8

sir,this process will add extra step to program,and will increase time, is there not any method so that it can be evaluated directly from the ode solver.

Walter Roberson 2011-11-8

Yes, but the possibilities to do it in the ode solver add extra steps and increase the time and programming bother _far_ more than using Jan's simple computation once after ode45() has returned.

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