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other variable inside odesolver

1 vue (au cours des 30 derniers jours)
pawan kumar
pawan kumar le 8 Nov 2011
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

Réponse acceptée

Jan
Jan le 8 Nov 2011
What about using "k = (c(:, 1)+c(:, 3))/2" to calculate the value of k afterwards?
  2 commentaires
pawan kumar
pawan kumar le 8 Nov 2011
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
Walter Roberson le 8 Nov 2011
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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