How to build a graph using stem for a given equation?

Question

Kirin 2024-3-16

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2095261-how-to-build-a-graph-using-stem-for-a-given-equation

评论： Voss 2024-3-16

As I understand it, the program stumbles over calling the delta function and builds one point. How can I display the desired graph without making the code too heavy?

Main script:

a1=1.7;
b1=9;
subplot(221);
n1=0:20;
x1=a1*delta(n1-b1);
stem(n1, x1);

File delta function (its use is mandatory):

function [ d ] = delta( n )
if n == 0
    d = 1;
else
    d = 0;
end
end

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Answer 1

Voss 2024-3-16

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2095261-how-to-build-a-graph-using-stem-for-a-given-equation#answer_1426321

编辑：Voss 2024-3-16

在 MATLAB Online 中打开

Your delta function makes d a scalar. Instead d should be the same size as n, with value 1 where n is 0 and value 0 everywhere else. If you can modify the delta function, do it.

a1=1.7;

b1=9;

% subplot(221);

n1=0:20;

x1=a1*delta(n1-b1);

stem(n1, x1);

function d = delta( n )

d = zeros(size(n)); % initialize d to be an array of 0 the same size as n

d(n == 0) = 1; % set d to 1 where n is 0

end