Why do I get "Array indices must be positive integers or logical values" error when using?

2020 9 1
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更新时间：2020 9 1
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Array indices must be positive integers or logical values.
clc;
clear;
y(1)=0;
y(2)=1;
k=3.50
y=2 - 0.4 +1.2*y(k-1) -0.72*y(k-2);
stem(k,y,'linewidth',2);
grid;
xlabel('K');
k=0.49;

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James Tursa
James Tursa 2020-9-1
编辑：James Tursa 2020-9-1

0 个投票

k is 3.5
So y(k-1) is y(2.5) and y(k-2) is y(1.5). The indexes are not positive integers, hence the error.
Maybe you meant
k = 3;
y(k) = 2 - 0.4 +1.2*y(k-1) -0.72*y(k-2);

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