MATLAB程序总是出现?Error using ==> stem at 44 X must be same lengt

来源：学生作业帮编辑：作业帮分类：综合作业时间：2024/04/29 14:21:37

MATLAB程序总是出现?Error using ==> stem at 44 X must be same length as Y.
%hammingchuang.m
M=11;
n=[0:1:M-1];
wc=0.3*pi;
hd=ideal_lp(wc,M);
w_rec=(boxcar(M))';
w_ham=(hamming(M))';
h_rec=hd.*w_rec;
h_ham=hd.*w_ham;
[db1,mag1,pha1,grd1,w1]=freqz_m(h_rec,[1]);
[db2,mag2,pha2,grd2,w2]=freqz_m(h_ham,[1]);
figure(1)
subplot(2,2,1);stem(n,hd,'k');grid
title('加窗前脉冲响应')
axis([0 M-1 -0.2 0.5]);ylabel('hd(n)')
subplot(2,2,2);stem(n,h,'k');grid
title('加窗后脉冲响应')
axis([0 M-1 -0.2 0.5]);ylabel('h(n)')
subplot(2,2,3);plot(w1/pi,db1,'k');grid
title('加汉明窗前幅频特性（dB)')
axis([0 1 -100 10]);ylabel('Decibels')
set(gca,'XTickMode','manual','XTick',[0,0.2,0.3,1])
set(gca,'YTickMode','manual','YTick',[-50,0])
subplot(2,2,4);plot(w2/pi,db2,'k');grid
title('加汉明窗后幅频特性（dB)')
axis([0 1 -100 10]);ylabel('Decibels');
set(gca,'XTickMode','manual','XTick',[0,0.2,0.3,1])
set(gca,'YTickMode','manual','YTick',[-50,0])
运行后出现：
Error using ==> stem at 44
X must be same length as Y.

X跟Y两个矩阵的长度不一样啊没有一一对应的点 matlab是不能给你作图的而且你这程序需要很多自定义的函数单贴这个出来也给你运行不了
再问：自定义的函数已经定义好了，就是搞不懂这个错误。
再答：那你只能检查一下你的所有用到stem的函数的地方，看类似于stem(x,y)的这种格式下，x跟y是不是同维的矩阵、向量，如果不是，那是没法作图的

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