[問題] Dsolve出了問題不太理解
f = 0.005
g[t_] := 2 UnitStep[t] - 4 UnitStep[t - f] + 4 UnitStep[t - 2 f] -
4 UnitStep[t - 3 f] + 4 UnitStep[t - 4 f] - 4 UnitStep[t - 5 f] +
4 UnitStep[t - 6 f]
sol = DSolve[{v'[t] + v[t]/(50*10^-9*7000) == (g[t])/(50*10^-9*7000),
v[0] == 0}, v, t]
可是當我跑完上面那一行時，他就會出現Reduce::ratnz: Reduce was unable to solve the system with inexact
coefficients. The answer was obtained by solving a corresponding exact system
and numericizing the result. >>
我要做的事情大概就是個RC電路用方波時的圖形，可是當我打出v[0]=0的時候他就會跑出
上面那一行，請問我應該怎麼辦?
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