'm new to matlab what these symbols mean ?

does the 'escalon' means unit step function ?

and what does the 'pulsow ' means ?

here I tried to solve the excersise but can you check please.

n = -10:10;

e_2= [ones(1,10) zeros(1,11)];

stem(n , e_2);

axis([-10 10 0 1.5]);

title ('-u[n]');

xlabel('time index n');

ylabel ('e_2');

n = -10:10;

e_3= [zeros(1,11) ones(1,10)];

stem(n , e_3);

axis([-10 10 0 1.5]);

title ('u[n-1]');

xlabel('time index n');

ylabel ('e_3');

n = -10:10;

e_4= 2*[zeros(1,11) ones(1,10)];

stem(n , e_4);

axis([-10 10 0 1.5]);

title ('2*u[n-1]');

xlabel('time index n');

ylabel ('e_4');

Answer 1

[Steven Lord]

If you forced me to guess I'd say that those terms are probably defined in "the previous script" but I can't be certain. You probably should ask your professor and/or teaching assistant for help understanding what the assignment asks you to do.