Continuous signal, Can anyone help me?

Continuous signal. The signal must be a sum of steps and the user to choose the number of steps and each step also defines the initial time and amplitude, as follows. x (t) = a1u(t-t1)+a2u(t-t2) + …

Can anyone help me

Answer 1

[Azzi Abdelmalek]

t=0:0.01:10
a1=1;
a2=4;
t1=1;
t2=3;
y=a1*heaviside(t-t1)+a2*heaviside(t-t2)
plot(t,y)

[Image Analyst]

heaviside is in the Symbolic Math Toolbox. Type ver on the command line to see if you have it (I don't).

[Azzi Abdelmalek]

Manuel commented

Well I Have done this code but …

if true
% code
%Input deg initial value
Deg=input('Input number:\n');
%for each new data values put new amplitude and new initial time
for x = 1:Deg
 a(x)=input('input amplitude:\n');
 i(x)=input('input initial time:\n');
end
end

[Azzi Abdelmalek]

At the end of your code add

t=0:0.01:100
out=sum(cell2mat(arrayfun(@(x,y) x*heaviside(t-y),a',i','un',0)))
plot(t,out)

[Manuel]

Error using arrayfun All of the input arguments must be of the same size and shape. Previous inputs had size 8 in dimension 1. Input #3 has size 7.

Error in miniProjecto (line 12) out=sum(cell2mat(arrayfun(@(x,y) x*heaviside(t-y),a',i','un',0)))

[Azzi Abdelmalek]

Type

disp(i)
disp(a)

What did you get?

[Manuel]

This shows the values I put input. Example: Deg =3; for each drag input a =1; input i =2 ; y=a(1)u*(t-t(2) disp(deg)=1 input a =3; input i =4 ; y=a(1)u*(t-t(2))+a(3)u*(t-t(4)) disp(deg)=2

input a =1; input i =5 ; y=a(1)u*(t-t(2))+a(3)u*(t-t(4))+a(1)u*(t-t(5)) disp(deg)=3

and y=a(1)u*(t-t(2))+a(3)u*(t-t(4))+a(1)u*(t-t(5))+…+ a(x)u*(t-t(x)) disp(deg)=x

[Azzi Abdelmalek]

Post the code you tried

[Manuel]

if true
  Deg=input('Introduza o numero de degraus:\n');
for x = 1:Deg

a=input('Introduza um valor para Amplitude:\n'); i=input('Introduza um valor para o Instante inicial:\n'); disp(i) disp(a)

end

end

[Azzi Abdelmalek]

Try this

Deg=input('Introduza o numero de degraus:\n');
for x = 1:Deg
a(x)=input('Introduza um valor para Amplitude:\n'); 
i(x)=input('Introduza um valor para o Instante inicial:\n');  
end
t=0:0.01:100
out=sum(cell2mat(arrayfun(@(x,y) x*heaviside(t-y),a',i','un',0)))
plot(t,out)

[Manuel]

Is correct can explain me this last 3 code lines?

[Azzi Abdelmalek]

Try this one, simple to understand

t=0:0.01:100 
Deg=input('Input number:\n');
out=zeros(1,numel(t));
for x = 1:Deg
 a(x)=input('input amplitude:\n');
 i(x)=input('input initial time:\n');
 out=out+a(x)*heaviside(t-i(x))
end
plot(t,out)