Matlab錯誤，矩陣尺寸不同意

Question

即時嘗試繪製2個數字，使用fplot和繪圖功能，但對於我的情節（圖2），我得到一個錯誤，不明白爲什麼;

錯誤使用/ 矩陣尺寸必須一致。 （行9） H = 3 * g /（（fo/f）。^ 2 + 3 *（fo/f）+3）;

錯誤@（F）bhpfilter（F，FO，克）

function [H] = bhpfilter(f, fo, g) 
    %freq finds the filter frequency response in V/V 
    %fo is the cut off frequency, f is the input frequency and g is the filter 
    %gain 

    if fo <= 0 || g <=0 %error checking 
     error('Inputs invalid'); 
    else 
     H = 3*g/((fo/f).^2 + 3*(fo/f)+3); 

    end 

    fo=1200.; 
    g=2.; 

    H =@(f) bhpfilter(f,fo,g); 
    H_1 = @(f) bhpfilter (f,fo,g)-0.8; 

    figure (1); 
    fplot(H,[0 2000]); 
    title('Plot of H vs f using fplot'); 
    xlabel('Frequency (Hz)'); 
    ylabel('Filter frequency response (V/V)'); 

    fprintf('The value of f that gives a response of 0.8 is %f Hz\n',fzero (H_1, [0 2000])); %placed this line of code here so that it can be visible in command window , showing it works 

    figure (2); 
    plot([0:2000],H([0:2000])); % code will find individual values of H(1), H(2) etc.. but will not find H([0:200]) 
    title('Plot of H vs f using plot'); 
    xlabel('Frequency (Hz)'); 
    ylabel('Filter frequency response (V/V)'); 

Answer 1

在線路H = 3*g/((fo/f).^2 + 3*(fo/f)+3);克和FO是標量，而f是一個矢量。對於除法，當MATLAB是標量/矢量（它反其道而行之時）時，MATLAB不會將其識別爲單元劃分。你必須把：

H = 3*g ./ ((fo./f).^2 + 3*(fo./f)+3); 

希望有所幫助。