So t1, t2, t3 are subscripts, and time(p) is either a function or array that results in either a scalar or else a length(t1) by length(t2) by length(t3) array. Afterwards, period will be max(t1) by max(t2) by max(t3) in size.
t1 = (1,3,4,6,8,9,0,5,4,)
0 is not a valid index, so t1 cannot be used as a subscript for an array.
For the sake of continuing the discussion, let us instead say
t1 = [1,3,4,6,8,9,10,5,4]
t2 = 
t3 = [4,56,7,8,5,1]
and now we know that whatever time(p) is, it must be either a scalar or else a 9 x 1 x 6 array
i want to show the 5th element of t1 as the output.
but what does that have to do with "inside another array" ??