bodemag.m 函數(shù)，執(zhí)行很慢，個(gè)人認(rèn)為是for 循環(huán)導(dǎo)致時(shí)間很長(zhǎng)；

原代碼：

  % for i = 1:length(omega)

% s = 1i * omega(i);

% H_num = polyval(num, s);

% H_den = polyval(den, s);

% H = H_num / H_den;

% magnitude(i) = 20 * log10(abs(H));

% end

可以修改為：

omega= 1:1:length(omega)

s = 1i .* omega;

H_num = polyval(num, s);

H_den = polyval(den, s);

H = H_num ./ H_den;

magnitude = 20 * log10(abs(H));

采用向量的形式計(jì)算速度會(huì)更快一點(diǎn)；for 循環(huán)太慢了；