FFT from a time signal with unequal time increment

3 次查看（过去 30 天）
Hossein
Hossein 2016-1-27
回答： Star Strider 2016-1-27
Hi everyone, I am trying to take a FFT from a simulated time signal, which is resulted from an ODE simulation. The problem is the unequal time steps by ODE and I don't know how should I make this FFT analysis in this case. Concerning the T as the time vector and Y as a simulated time signal, can anybody tell me how should I perform the FFT analysis? Many thanks in advance!

请先登录，再回答此问题。

回答（1 个）

Star Strider
Star Strider 2016-1-27
I would go back and re-run the ODE with a fixed time step, then use that to calculate the FFT.
Instead of giving the ODE solver a ‘tspan’ vector of a beginning and end time, such as:
tspan = [t_start t_end];
give it a constant-step vector instead:
tspan = linspace(t_start, t_end, 50);
to create (for example) a 50-element equal-step time vector. The ODE solver will report the solutions very close to the time steps you specify.

类别

在 Help Center 和 File Exchange 中查找有关 Ordinary Differential Equations 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by