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

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;

[praveen sebastian]

The is question is like

A signal is composed of 4 frequency components and is given as

x(t) = 2sin( 200t) − 3cos(1000t) − 0.5sin(1500t) + sin( 2500t) and is sampled at 6000Hz.

Plot the signal in time domain for t=0:(1/Fs):1

[MOHAMUD abukar]

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]

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.

Answer 1

[Stephan Ciobanu]

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);

[praveen sebastian]

thanks got the answer

Answer 2

[Alan Stevens]

Either you want

stem(t,xaa);

or you want to use t1 in the definitions of xa11, xa22 etc.

[praveen sebastian]

thanks got the answer