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

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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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Accepted Answer

James Tursa
James Tursa on 1 Sep 2020
Edited: James Tursa on 1 Sep 2020
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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