How do I convert this integral equation to matlab code?

1 次查看（过去 30 天）
John Doe
John Doe 2015-3-30
回答： Torsten 2015-3-30
I'm trying to write a matlab program for a Lock-in Amplifier, based on this equation:
where Fref is the frequency you're trying to extract, t the current time sample, T the total time, Fin the input signal and phi is the phase. Reference: http://en.wikipedia.org/wiki/Lock-in_amplifier
When it comes to the integration I'm stuck. My phase is 0, my time is 4.8828 seconds incrementing in 0.002 second steps per signal sample.
sigRef = 25;
mult = 2*pi*sigRef;
t=[0:1/512:4.8828];
Uin = trialDataL; % same length as t
fun = @(x) sin(mult*t(x)*Uin(x));
q = integral(fun,1,2)
"Integral" doesn't like using x as an index instead of a numeric value, but I don't know how to get t and Uin to both change samples at the same time.

请先登录，再回答此问题。

采纳的回答

Torsten
Torsten 2015-3-30
Use trapz instead of integral.
Best wishes
Torsten.

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Calculus 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