On Sat, Aug 01, 2020 at 02:09:58AM -0700, Roustam Shaitan wrote:
> Hello,
>
> Why do I get an empty list at (8) as a result of the following commands?
>
> (1) v:=operator 'v
> (2) m*a=-m*g-k*v(t)
> (3) subst(%% 2, a=D(v(t),t))
> (4) solve(%% 3, v, t=0, [V0])
> (5) integrate(%% 4, t=0..t)
> (6) subst(%% 5, [V0=Vx, g=0]) = s
> (7) subst(%% 5, V0=Vy) = 0
> (8) solve([%% 6, %% 7], [s, t])
This is limitation of current solver, it can not do much
in multivariate case when there are transcendental functions.
In this case substituting variable for 'exp(-k*t/m)' or
just command like:
solve(..., [s, exp(-k*t/m)])
works.
--
Waldek Hebisch
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