About differentiation of plot after filtering the vector using filter(b,a,x)

1 次查看（过去 30 天）

rathod ujjval rameshbhai 2016-3-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/272195-about-differentiation-of-plot-after-filtering-the-vector-using-filter-b-a-x

评论： rathod ujjval rameshbhai 2016-3-8

model_input1_Ziegler_Nicholus.fig

I have a problem that I want to difrentiate the data to find the maximum but my data contains small spikes....so i need to filter it first..

with command filter it is not working because it takes approximation of past values so the vector elements becomes same,,,, making diffrentiation zero!!!

please find the attachment and

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

rathod ujjval rameshbhai 2016-3-8

clc;clear; open('C:\Users\UJJVAL\Desktop\model_input1_Ziegler_Nicholus.fig') h=gcf; get(h); ax=gca; T=get(ax,'children'); t=get(T,'XData'); y=get(T,'YData'); a = 1; b = [1/4 1/4]; f=filter(b,a,y); plot(t(7:end),f(7:end)); df=(diff(f,1,2)./diff(t,1,2)); ylim([0 0.5]);plot(t(2:end),df);grid on;

请先登录，再进行评论。

请先登录，再回答此问题。