清空筛选条件
清空筛选条件

using dsolve to equation

3 次查看（过去 30 天）
Brenda Galabe
Brenda Galabe 2018-12-12
评论： Brenda Galabe 2018-12-12
equation is : d(x1)/dt (t) = -x1(t)*alpha+p
syms x1 t
tank1 = 'diff (x1,t)= - x1* alpha + p'
soln1 = dsolve(tank1,'x1(0) = 0')
it worked at somepoint then i cleared my workspace and then poof stopped. im guessing i had declared something in syms but dont remember ma
error getting
Error using mupadengine/feval (line 163)
Cannot identify differential equations. To solve
algebraic equations, use 'solve' or 'vpasolve'.
Error in dsolve>mupadDsolve (line 336)
T = feval(symengine,'symobj::dsolve',sys,x,options);
Error in dsolve (line 193)
sol = mupadDsolve(args, options);

请先登录，再回答此问题。

采纳的回答

madhan ravi
madhan ravi 2018-12-12
编辑：madhan ravi 2018-12-12
Define alpha as symbolic variable , remove strings and before -x1 it should be == and intial condition x(0)==0 without strings around it

更多回答（1 个）

Torsten
Torsten 2018-12-12
编辑：Torsten 2018-12-12
syms x1(t) alpha p
eqn = diff(x1,t) == -x1*alpha+p;
cond = x1(0) == 0;
x1Sol(t) = dsolve(eqn,cond)

类别

在 Help Center 和 File Exchange 中查找有关 Symbolic Math Toolbox 的更多信息

标签

产品


版本

R2015b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by