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How to use ode() solver
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Hello, I have following code:
ftod_sym=detofJac(doy); %here I calculate my symbolic vectorfield ftod_sym which is a function of y1 y2 and t
myfun = matlabFunction(ftod_sym); %conversion
[T N]=ode15s(@(y,t)myfun,tspan,n0,optionsO); % n0 is a vector with 2 elements
I get following ERROR:
Error using odearguments (line 93)
@(Y,T)MYFUN returns a vector of length 1, but the length of initial conditions vector is 2. The vector returned
by @(Y,T)MYFUN and the initial conditions vector must have the same number of elements.
Error in ode15s (line 149)
[neq, tspan, ntspan, next, t0, tfinal, tdir, y0, f0, odeArgs, odeFcn, ...
Error in flipflop_NR (line 46)
[T N]=ode15s(@(y,t)myfun,tspan,n0,optionsO);
Thank You
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回答(1 个)
Walter Roberson
2012-6-24
[T N]=ode15s(myfun,tspan,n0,optionsO);
You were not passing y and t to myfun, so you were not getting back the output you were expecting.
5 个评论
Walter Roberson
2012-6-24
Use subscripting of "y" right in your symbolic expression, and then just use myfun as the function handle.
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