access to element of variable in ode

function V=wffun(t,i)
[t,i] = ode15s(@wffun,tspan,i0)

ode return Matrix with length of k. how can i access element of t and i while ode is runing? in function wffun i use t(k-1) and t(k)

Answer 1

[Steven Lord]

If the differential equation you're solving includes a reference to the value of a component of the solution at an earlier time, you don't have an ordinary differential equation. Use a delay differential equation solver instead.

[siroos jalilyan]

No just i need value of "t" in previous step and current step in function wffun if use "t" just return one value .