Question

(MATLAB) In the same figure plot 7 vertically arranged DT sinusoids x k (m)=cos*2*pi*m/N, m=0,1,...6, using the function subplot(7,1,p).

Answer 1

1st simple  program :

clc;
close all;
clear;
N=7;
m=0:6;
xk=cos(2*pi*(m/N))
figure ;
plot(m,xk);
xlabel('m values');
ylabel('xk values');

output values:
xk =

1.0000 0.6235 -0.2225 -0.9010 -0.9010 -0.2225 0.6235

0.8 0.6 0.4 0.2 -0.2 -0.4 H -0.6 F 0.8 F m values
considering m values 0,0to1,1to2,2to3,3 to4,4to5,5to6 with incremnt 0.1

clc;
close all;
clear;
N=7;
m=0;
xk1=cos(2*pi*(m/N))
figure (1);
plot(m,xk1)
subplot(7,1,1);
xlabel('m values');
ylabel('xk1 values');
m=0:0.1:1;
xk2=cos(2*pi*(m/N))
plot(m,xk2)
subplot(7,1,2);
xlabel('m values');
ylabel('xk2 values')
m=1:0.1:2;
xk3=cos(2*pi*(m/N))
plot(m,xk3)
subplot(7,1,3);
xlabel('m values');
ylabel('xk3 values');
m=2:0.1:3;
xk4=cos(2*pi*(m/N))
plot(m,xk4)
subplot(7,1,4);
xlabel('m values');
ylabel('xk4 values');
m=3:0.1:4;
xk5=cos(2*pi*(m/N))
plot(m,xk4)
subplot(7,1,5);
xlabel('m values');
ylabel('xk5 values');
m=4:0.1:5;
xk6=cos(2*pi*(m/N))
plot(m,xk6)
subplot(7,1,6);
xlabel('m values');
ylabel('xk6 values');
m=5:0.1:6;
xk7=cos(2*pi*(m/N))
plot(m,xk7)
subplot(7,1,7);
xlabel('m values');
ylabel('xk7 values');

outputs:

xk1 =

1

xk2 =

1.0000 0.9960 0.9839 0.9640 0.9362 0.9010 0.8584 0.8090 0.7531 0.6911 0.6235

xk3 =

0.6235 0.5509 0.4739 0.3930 0.3090 0.2225 0.1342 0.0449 -0.0449 -0.1342 -0.2225

xk4 =

-0.2225 -0.3090 -0.3930 -0.4739 -0.5509 -0.6235 -0.6911 -0.7531 -0.8090 -0.8584 -0.9010

xk5 =

-0.9010 -0.9362 -0.9640 -0.9839 -0.9960 -1.0000 -0.9960 -0.9839 -0.9640 -0.9362 -0.9010

xk6 =

-0.9010 -0.8584 -0.8090 -0.7531 -0.6911 -0.6235 -0.5509 -0.4739 -0.3930 -0.3090 -0.2225

xk7 =

-0.2225 -0.1342 -0.0449 0.0449 0.1342 0.2225 0.3090 0.3930 0.4739 0.5509 0.6235

03 02 04- 0.2 02- -05- 29 28 26 24 23 2 . T -05- 4 F 44 43 42 69 6 6.4 35 63 6: 8 2

please check 2nd program all output last values compare to 1st program output values

they must be equal