Question

我写了以下函数：

function [output_signal] = AddDirectivityError (bat_loc_index, butter_deg_vector, sound_matrix)

    global chirp_initial_freq ;
    global chirp_end_freq;
    global sampling_rate;
    global num_of_mics; 
    global sound_signal_length;
    for (i=1 : num_of_mics)
        normalized_co_freq = (chirp_initial_freq + chirp_end_freq)/ (1.6* sampling_rate);
        A=sound_matrix  ( i, :  )  ;
        peak_signal=max(A);
        B=find(abs(A)>peak_signal/100);
        if (butter_deg_vector(i)==0)
            butter_deg_vector(i)=2;
        end
        [num, den] = butter(butter_deg_vector(i), normalized_co_freq, 'low');// HERE!!!
        filtered_signal=filter(num,den, A );
        output_signal(i, :)=filtered_signal;
    end

此函数运行多次，没有任何错误。但是，当我到达该行时：[num, den] = butter ( butter_deg_vector(i), normalized_co_freq, 'low');

局部变量是：i=3, butter_deg_vector(i)=1, normalized_co_freq=5.625000e-001

MATLAB提示错误说：

??? Error using ==> buttap Expected N to be integer-valued.

"Error in ==> buttap at 15 validateattributes(n,{'numeric'},{'scalar','integer','positive'},'buttap','N');

Error in ==> butter at 70 [z,p,k] = buttap(n);"

我不明白为什么会出现此问题，尤其是在此次迭代中。为什么这个函数会在这种情况下提示错误？

Answer 1

尝试更改以下代码行：

[num, den] = butter (round(butter_deg_vector(i)), normalized_co_freq, 'low');

MATLAB：butter（）命令中的错误

1 个答案: