Peak to Peak Value of Sinusoidal Grad

Question

k 2020-3-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/514405-peak-to-peak-value-of-sinusoidal-grad

评论： Star Strider 2020-3-31

I have a sinusoidal position vs. time graph. The graph is from time t=0s to t=40s. I need to caluclate the peak to peak amplitude between each of the peaks from 10 to 20 seconds. How would I do this?

I tried doing X1 = peak2peak(time) where X1 is the position values on the y axis of my graph, but it only returns one value.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Star Strider 2020-3-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/514405-peak-to-peak-value-of-sinusoidal-grad#answer_423186

Use the islocalmax function to find the maxima, islocalmin to find the minima, and go from there. (These functions were introduced in R2017b.)

2 个评论
显示无隐藏无

k 2020-3-31

I have R2016a

Star Strider 2020-3-31

在 MATLAB Online 中打开

Then use the Signal Processing Toolbox findpeaks function. To detect the peaks, use it normally, to detect the valleys,use findpeaks on the negated signal.

[pks,pklocs] = findpeaks(signal);
[vys,vylocs] = findpeaks(-signal);

Remember that the amplitudes of the valleys (the ‘vys’ variable) are the negatives of the returned values. The locations of both are valid regardless, and do not need to be changed.

请先登录，再进行评论。