partie 1, Octave - rextester

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partie 1

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%To view plots after 'plot' (and other plot-producing commands) this command must follow: 'print -dpng some_unique_plot_name.png;'
%It exports current plot to png image which then is sent to your browser
%GNU Octave 4.2.2

t1=-10:10;t=-10:10; t=-10:10; 
t2=-10:10; 
x2=exp(-0.2*t2); 
subplot(223); 
stem(t2,x2); 
axis([-10 10 -0.5 inf]); 
title('Exponentielle'); 
xlabel('x2'); 
ylabel('Amplitude') ;
t1=-10:10; 
x1=[zeros(1,10),ones(1,11)]; 
subplot(222); 
stem(t1,x1); 
axis([-10 10 -0.5 1.5]); 
title('Echelon unite'); 
xlabel('x1'); 
ylabel('Amplitude'); 
x=[zeros(1,10),1,zeros(1,10)]; 
subplot(221); 
stem(t,x); 
axis([-10 10 -0.5 1.5]); 
title('Impulsion unite'); 
xlabel('x'); 
ylabel('Amplitude'); 
subplot(224); 
stem(t,x2.*x1); 
axis([-10 10 -0.5 1]); 
title('Exponentielle amortie'); 
xlabel('x2'); 
ylabel('Amplitude'); 
fe=100; 
Te=1/fe; 
t=0:Te:1; 
x=5*sin(2*pi*10*t); 
y=10*sin(2*pi*5*t); 
subplot(511); 
plot(t,x,t,y,t,x+y); 
X=fftshift(fft(x));

print -dpng some_unique_plot_name.png;

[ + ] Show input
Temps de fonctionnement absolu: 1,11 sec, temps cpu: 1,65 sec, pic de mémoire: 59 Mo, temps de service absolu: 1,28 sec

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       15 | ------------------------------------------------ ----------- |        
       -5 | $ ** $$$$$ ** $$$ ** $$$$$ ** $$$ ** $$$$$ ** $$$ ** $$$$$ ** $ $$ ** $$$$$ ** $ |        
      -10 | ----------------------------------------------- ------------ |        
          0 0,2 0,4 0,6 0,8 1        
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                Exponentielle Exponentielle amortie           
                                                                               
        8 | - + 1 | - + F                    
        7 | - + 0,8 | - + * F                   
        6 | F + 0,6 | - + ** FF                 
        5 | * + F 0,4 | - + **** FF              
        4 | * + * FF Amplitude 0,2 | - + **** ** FF FF         
        3 | * + *** FF 0 | $$$$$$$$$$$$$$$$$$$$$$$$$        
        2 | * + **** * FFF -0,2 | - +                               
        1 | * + **** **** FFFF FFFF FFF -0,4 | - + + + + +        
        0 | ------------------------- | ---------------------- ---        
         -10-5 0 5 10-10-5 0 5 10

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