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

Question

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;

Expert Answer

Neeta Dsouza PhD Expert

Answered Aug 16, 2026

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);

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