# How do ones and zeroes work in plotting a graph?

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Dinesh G on 25 Dec 2021
Commented: Dinesh G on 25 Dec 2021
clc;
close all;
clear all;
t=-2:1:2;
y=[zeros(1,2),ones(1,1),zeros(1,2)]
y = 1×5
0 0 1 0 0
stem(t,y); This code is to plot an impulse graph, I don't understand how "zeroes", "ones" work here , I know they are used to create a matrix with all elements as zeroes and ones respectively.
thanks!

Walter Roberson on 25 Dec 2021
y=[zeros(1,2),ones(1,1),zeros(1,2)]
y = 1×5
0 0 1 0 0
is just a way of writing
y = [[0, 0], , [0, 0]]
y = 1×5
0 0 1 0 0
which then becomes
y = [0, 0, 1, 0, 0]
y = 1×5
0 0 1 0 0
so it is just saying "two zeros, one one, two zeros".
Another way of writing would have been
t=-2:1:2;
y = zeros(size(t));
y(t == 0) = 1;
stem(t, y) ##### 1 CommentShowHide None
Dinesh G on 25 Dec 2021
Thank you Walter Roberson!, and Merry Christmas!!

R2021b

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