急求。大神们,怎样在MATLAB中提 数据的极值啊

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估计LZ调用findpeaks函数没有用对。用LZ的dcp数据,程序如下,
xx=load('dcp.txt');
t=xx(:,1);
x=xx(:,2);
plot(t,x); grid; hold on
[K,V]=findpeaks(x);
thr=1200;
vdex=find(V>thr);
V1=V(vdex);
K1=K(vdex);
plot(t(K1),V1,'r.','linewidth',5);
title(['信号提取极值,阈值thr=' num2str(thr)]);
其中阈值可任意设置,图中红点表示极值点。

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