Why do I receive Vectors must be the same length error in this code?

t=-1:0.01:5;

f=(5*cos(pi*t)).*((t>=0)-(t>=1)); %input signal f(t)

h=1.5*((t>=0)-(t>=1.5)-1*((t>=2)-(t>=2.5))); % LTI system impulse response h(t)

t1=-1:5:length(y)

y= conv(f,h); %output signal y(t)

figure(1)

%plotting input signal f(t)

subplot(3,1,1)

plot(t,f)

%plotting impulse response of LTI h(t)

subplot(3,1,2)

plot(t,h)

%plotting output signal y(t)

subplot(3,1,3)

plot(t1,y)

Answer 1

[Ive J]

Error is very obvious: y and t1 don't have the same length. Try this

t1 = linspace(1, max(y), length(y));
plot(t1, y)

[ADLINA AZWEEN JOHANIS]

do you know if Iits normal for the amplitude of the convolution signal to be different from what we calculate manually.

[Ive J]

I'm not familiar with that, but conv(u, v) returns a vector of length numel(u) + numel(v) - 1