I would like to solve the following simultaneous differential equations by NDSolve.
When I tried to include a function g[t] in addition to functions f[t,1-10] that are defined by table, the following message appeared;
NDSolve::dsfun:“you cannot use {f[t,1],…,f[t,10]} as a function”.
When I deleted g[t] from the equations, it worked.
What is problem?
If you put your code into a Code Sample (the first icon) it could be copied into Mathematica without having to type it in.
I suspect your code would work if you used f[i][t] for your functions instead of f[t,i].
For example:
NDSolve[{D[f[1][t], t] == f[2][t], D[f[2][t], t] == f[1][t],
f[1][0] == 1, f[2][0] == 1}, {f[1][t], f[2][t]}, {t, 0, 1}]
Thank you for quick reply. Following your suggestion it worked. Based on this example code, I found that if I rename the function g[t] as f[3][t] it also worked.