t = linspace-5 5 1000;g2 = zerossizet;g2abst 2 = 1;f = g2;subplot211;plott f; F=fftf;subplot222;plotabsF;错误为错误使用plot向量长度必须相同

t = linspace(-5, 5, 1000); g2 = zeros(size(t)); g2(abs(t) < 2) = 1; f = g2; subplot(2,1,1); plot(t, f);
F=fft(f); subplot(2,1,2); % 修改为subplot(2,1,2) plot(abs(F));