Chap1_plotting_sol - ’Time (sec)’ ) ylabel( ’x(t)’...

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2. The following commands were saved in an M-file: % a) t1 = -8:-4; x1 = zeros(size(t1)); t2 = -4:3; x2 = t2+2; t3 = 3:8; x3 = t3-2; t = [t1 t2 t3]; x = [x1 x2 x3]; subplot(221),plot(t,x) xlabel( ’Time (sec)’ ) ylabel( ’x(t)’ ) title( ’a)’ ) % b) t = t+1; subplot(222),plot(t,x) xlabel( ’Time (sec)’ ) ylabel( ’x(t)’ ) title( ’b)’ ) % c) n1 = -6:1; x1 = zeros(size(n1)); n2 = 2:3; x2 = 2*n2-4; n3 = 4:8; x3 = 4-n3; n = [n1 n2 n3]; x = [x1 x2 x3]; subplot(223),stem(n,x) xlabel( ’n’ ) ylabel( ’x[n]’ ) title( ’c)’ ) % d) n = n-1; subplot(224),stem(n,x) xlabel( ’n’ ) ylabel( ’x[n]’ ) title( ’d)’ ),subplot(111) -10 -5 0 5 10 -2 0 2 4 6 Time (sec) x(t) a) -10 -5 0 5 10 -2 0 2 4 6 Time (sec) b) -10 -5 0 5 10 -4 -2 0 2 n x[n] c) -10 -5 0 5 10 -4 -2 0 2 n d)
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3. 0 0.5 1 1.5 2 -4 -2 0 2 4 Time (sec) x(t) 1 a) 0 5 10 -4 -2 0 2 4 Time (sec) x[n] 1 b) 0 20 40 60 -2 -1 0 1 2 Time (sec) 1 c) -2 0 2 4 6 -4 -2 0 2 4 Time (sec) 1 d) 0 5 10 15 20 -4 -2 0 2 4 Time (sec) 1 e) -10 -5 0 5 10 -2 0 2 4 6 Time (sec) 1 f)
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Here is an M-file that contains the script to plot generate these plots: % a) % period is 2/5, so 2 sec is long enough for plot t = 0:.4/100:2; x = 4*cos(5*pi*t-pi/4); subplot(2,2,1),plot(t,x) xlabel(
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Unformatted text preview: ’Time (sec)’ ) ylabel( ’x(t)’ ) title( ’a)’ ) % b) % period is n=2, so plot for n=0 to 10 n=0:10; x = 4*cos(pi*n);; subplot(2,2,2),stem(n,x) xlabel( ’Time (sec)’ ) ylabel( ’x[n]’ ) title( ’ b)’ ) % c) % not periodic, try plotting for various lengths to see how it looks n=0:60; x = 2*sin(3*n);; subplot(2,2,3),stem(n,x) xlabel( ’Time (sec)’ ) ylabel( ’x(t)’ ) title( ’c)’ ) % d) % period is 2pi/4, so plot for 4 cycles T = 2*pi/4; t = -T:T/50:3*T; x = cos(4*t)+2*sin(8*t); subplot(2,2,4),plot(t,x) xlabel( ’Time (sec)’ ) ylabel( ’x(t)’ ) title( ’d)’ ) % e) % not periodic, see how it looks for various lengths t = 0:.02:20; x = 3*cos(4*t)+sin(pi*t); figure(2) % opens new window subplot(2,2,1),plot(t,x) xlabel( ’Time (sec)’ ) ylabel( ’x(t)’ ) title( ’e)’ ) subplot(1,1,1)...
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Chap1_plotting_sol - ’Time (sec)’ ) ylabel( ’x(t)’...

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