首頁猿問求高手幫助，為什么會出現(xiàn)butte...

求高手幫助，為什么會出現(xiàn)butter函數(shù)的問題，怎么解決？求大俠指點！

數(shù)學(xué)

天涯盡頭無女友 2023-04-20 19:15:59

寫好的程序運行時出現(xiàn)如下錯誤，??? Undefined function or method 'butter' for input arguments of type 'double'.Error in ==> Shot_time_cross_zero_rate at 4[b,a]=butter(4,[0.025 0.85]);%4階巴特沃斯濾波器，上下截止頻率100Hz，3400Hz程序前4行如下clear allclose all[x,fs,bit]=wavread('F:\test.wav');[b,a]=butter(4,[0.025 0.85]);%4階巴特沃斯濾波器，上下截止頻率100Hz，3400Hz

查看完整描述

2 回答

慕的地6264312

TA貢獻(xiàn)1817條經(jīng)驗獲得超6個贊

從錯誤提示來看，應(yīng)該是傳遞給butter函數(shù)的實參錯誤。
從樓主的調(diào)用來看應(yīng)該是下面這三種情況：
應(yīng)該是少了一個參數(shù)，導(dǎo)致報錯。

If Wn is a two-element vector, Wn = [W1 W2], butter returns an
order 2N bandpass filter with passband W1 < W < W2.
[B,A] = butter(N,Wn,'high') designs a highpass filter.
[B,A] = butter(N,Wn,'low') designs a lowpass filter.
[B,A] = butter(N,Wn,'stop') is a bandstop filter if Wn = [W1 W2].