what is the purpose of u1 and u2 in this code?

t=-1:0.01:6;

u1=[zeros(1,100),ones(1,601)];

u2=[zeros(1,600),ones(1,101)];

u=u1-u2;

x=10*u;

plot(t,x)

Answer 1

[Star Strider]

They create (1x701) vectors with different numbers of zeros and ones.

The overall effect (that is easily seen if plotted) is to create a square pulse that is equal to 1 from 0 to 5, and 0 elsewhere.

(There are easier and more efficient ways to do this.)

[omar alrehaili]

could you please show me another way to do this code?

[Star Strider]

Sure!

The easiest way I can code:

t=-1:0.01:6;
sqwv = (t >= 1) & (t <= 5);

figure
plot(t, sqwv)
grid
ylim(1.1*ylim)

producing the same result as the original code in your Question.

The logical vector created in ‘sqwv’ is converted to numeric when used in a calculation (such as in an argument to the plot function).

[Walter Roberson]

plot(t, 10*sqwv)

Answer 2

[Walter Roberson]

They are unit step functions with different initial times.