Differential Equation

[Enrique Fernandez]

Hello,
Because you have use ode45.
For example:
function osc=f(x,t);
    osc = -1.01*x;
endfunction
x0=1000;
t=linspace(0,100,100);
[Vt, Vx]=ode45(@f,t,x0);
plot(Vt, Vx);

Enrique Fernandez


William Christopher Carleton escribió:
> I'm new to Octave and have tried to set up a simple differential equation that demonstrates variable behaviour as a result of a constant 'r'.
>
> octave:1>function osc=f(x,t);
>   
>> osc = -1.01*x;
>> endfunction
>>     
>
> octave:2> x0=1000
> octave:3> t=linspace(0,100,100)
> octave:4> x=lsode("f",x0,t)
> octave:5> plot(t,x)
>
> The above equation should demonstrate an increasing oscillation, but instead plots as an exponential decay. What have I done incorrectly? Thanks,
>
> Chris
>
>
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