Need Help..............Error using stem (line 43) X must be same length as Y.

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praveen sebastian
praveen sebastian 2021-1-13
移动：DGM 2022-10-30
close all;
clear all;
clc;
fs=6000;
t=0:0.001:.1;
t1=0:1/fs:1;
f1=200;
f2=1000;
f3=1500;
f4=2500;
xa1=2*sin(f1*pi*t);
xa2=3*cos(f2*pi*t);
xa3=.5*sin(f3*pi*t);
xa4=sin(f4*pi*t);
xa11=2*sin(f1*pi*t);
xa22=3*cos(f2*pi*t);
xa33=.5*sin(f3*pi*t);
xa44=sin(f4*pi*t);
xa=xa1-xa2-xa3+xa4;
xaa=xa11-xa22-xa33+xa44;
subplot(2,1,1);
plot(t,xa);
ylabel('Amplitude');
xlabel('time t')
title('original wave')
hold on;
subplot(2,1,2);
stem(t1,xaa);
ylabel('Amplitude');
xlabel('time t')
title('Wave sampled at Fs=6000')
hold on;
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MOHAMUD abukar
MOHAMUD abukar 2022-10-30
移动：DGM 2022-10-30
close all;
clear all;
clc;
n=-2:2;
x=[0.5, 2, -1.5, 2.5, 4, 3, -2, 3.5, 2, 0.5];
subplot(2,1,1);
stem(n,x);
xlabel('Time Sample');
ylabel('Amplitude');
title('Original sequence');
axis([-5,5,-5,8]);
m=n-3;
subplot(2,1,2);
stem(m,x);
xlabel('Time Sample');
ylabel('Amplitude');
title('Time shifted signal');
axis([-5,5,-5,8]);
DGM
DGM 2022-10-30
移动：DGM 2022-10-30
How many elements are there in n? How many are in x? Are they equal? Why aren't they equal? Since they're all constants asserted arbitrarily, you're the only person who can answer that question.

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采纳的回答

Stephan Ciobanu
Stephan Ciobanu 2021-1-13
xaa is an 1x101 array and t1 is 1x6001 array.
Put t1 instead of t when you define xa11,xa22,xa33,xa44
xa11=2*sin(f1*pi*t1);
xa22=3*cos(f2*pi*t1);
xa33=.5*sin(f3*pi*t1);
xa44=sin(f4*pi*t1);

更多回答（1 个）

Alan Stevens
Alan Stevens 2021-1-13
Either you want
stem(t,xaa);
or you want to use t1 in the definitions of xa11, xa22 etc.

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